英语四级考试接力出版社语法
【篇一】2020年12月大学英语四级重点语法知识
英语四级重点语法知识：条件状语从句
连接词主要有 if, unless, as/so long as, on condition that 等。.
if 引导的条件句有真实条件句和非真实条件句两种。做物非真实条件句已在虚拟语气中阐述。
unless = if not.
Let's go out for a walk unless you are too tired.
If you are not too tied, let's go out for a walk.
典型例题
You will be late ___ you leave immediately.
A. unless B. until C. ifD. or
答案A。 句意：除非你立即走，否则你就回迟到的。可转化为 If you dong leave immediately, you will be late.B、差胡虚D句意不对，or表转折，句子如为 You leave immediately or you will be late.
【篇二】2020年12月大学英语四级重点语法知识
英语四级重点语法知识：让步状语从句
though, although
注意： 当有though, although时，后面的从句不能有but，但是 though 和yet可连用
Although it's raining, they are still working in the field.
虽然在下雨，但他们仍在地里干活。
He is very old, but he still works very hard.
虽然他很老，但仍然努力地工作。
Though the sore be healed, yet a scar may remain.
伤口虽愈合，但伤疤留下了。 (谚语)
典型例题
1) ___she is young, she knows quite a lot.
A. WhenB. However C. Although D. Unless
答案：C。意为虽然她很年轻，却知道许多。
2)as, though 引导的倒装句
as / though引导的让步从句必须表语或状语提前(形容词、副词、分词、虚燃实义动词提前)。
Child as /though he was, he knew what was the right thing to do.
= Though he was a small child, he knew what was the right thing to do.
注意： a.句首名词不能带任何冠词。
b.句首是实义动词，其他助动词放在主语后。如果实义动词有宾语和状语，随实义动词一起放在主语之前。
Try hard as he will, he never seems able to do the work satisfactorily.
= Though he tries hard, he never seems…
虽然他尽了努力，但他的工作总做的不尽人意。
3)ever if, even though.即使
We'll make a trip even though the weather is bad.
4) whether…or- 不管……都
Whether you believe it or not, it is true.
5)"no matter +疑问词" 或"疑问词+后缀ever"
No matter what happened, he would not mind.
Whatever happened, he would not mind.
替换：no matter what = whatever
no matter who = whoever
no matter when = whenever
no matter where = wherever
no matter which = whichever
no matter how = however
注意：no matter 不能引导主语从句和宾语从句。
(错)No matter what you say is of no use now.
(对)Whatever you say is of no use now.
你现在说什么也没用了。(Whatever you say是主语从句)
(错)Prisoners have to eat no matter what they're given,
(对)Prisoners have to eat whatever they're given.囚犯们只能给什么吃什么。
【篇三】2020年12月大学英语四级重点语法知识
英语四级重点语法知识：原因状语从句
比较：because, since, as和for
1)because语势，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。
I didn't go, because I was afraid.
Since /As the weather is so bad, we have to delay our journey.
2)由because引导的从句如果放在句末，且前面有逗 号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。
He is absent today, because / for he is ill.
He must be ill, for he is absent today.
B. 2021年上半年英语四级语法用法详解
【 #四六级考试# 导语】梦想在前方，努力在路上。对于考生来说，拿到证书就是我们向往的远方。以下是“2021年上半年英语四级语法用法详解”，欢迎阅读参考！更多相关讯息请关注 ！【篇一】2021年上半年英语四级语法用法返缓尘详解
1. come 和 go 是一对反义词，come(来)所表示的方向是朝向说话者的位置，而go(去)所表示的方向是离开说话者的位置。如：come here(来这儿)，come to school(来上学)，go there(去那儿)，go to school(去上学)。
2. 两者之后均可用 and 来代替一个表目的的不定式。如：
Come and have a drink. 来喝一杯。
He went and bought some envelopes. 他去买了些信封。
3. come 之后可接不定式，表示经过某一过程而发生某一情况，常译为“开始”“渐渐地”“终于”，但是动词go不能这样用。如：
How did you come to know her? 你是怎么认识她的?
You'll come to understand your parents someday. 你总有一天会理解你的父母。
4. come 和 go 之后均可接现在分词，但有区别：
(1) come+现在分词，主要用来说明“来”的方式。如：
He came running to welcome us. 他跑过来欢迎我们。
The children came running to meet us. 孩子们跑着来迎接我们。
A large stone came flying through the window. 从窗外扔进来一块大石头。
另外，该结构还可用来谈论体育和娱乐活动，与go doing sth用法相似，只是“方向”不同。如：
Would you like to come sailing? 你愿意来坐船游览吗?
Come swimming with us tomorrow. 明天跟我们一起游泳吧。
Why don't you come ice-skating with us tonight? 今晚来和我们一起溜冰好吗?
(2) go+现在分词，漏禅表示“去做……”，这类词组大多与体育、娱乐、日常生活等有关。如：
We often go swimming together. 我们常一道去游泳。
Let's go boating this afternoon. 今天下午我们去划船吧。
He finished lunch and went shopping. 他吃完午饭而后去买东西。
另外，该结构有时还可表示警告，用于建议做某事不好的事，此时多用于否定句。如：
Don't go saying that! 不要这样讲话!
Don't go looking for trouble, Maria. 不要去找哪拿麻烦了，玛丽亚。
You shouldn't go boasting about your achievements. 你不应当夸耀你的成就。
5. come 和 go 都可用作连系动词，表示事物状态的变化。如：
The handle has come loose. 这个把柄松了。
The children must not go hungry. 孩子们不应挨饿。
两者之后所接形容词通常各有其特点，有时还可从好坏方面去区别：即 come 用于“好”的变化，go 用于“坏”的变化。如：
Her dream has come true. 她的梦想实现了。
Fish soon goes bad in hot weather. 大热天鱼很容易坏。
另外，表示人的生理变化通常用 go，如go blind(变瞎)，go deaf(变聋)，go grey(两鬓渐白)等，但是go通常不与 old, ill, tired 等连用。
6. come 有时可以表示参加到对方的活动之中去(即使这种运动方向本身要求用 go)。如：
A：Will you come to see me tonight? 今晚来看我好吗?
B：Yes, I'll come. 好，我来。
A：Please come at once. Dinner is ready. 晚餐准备好了，请快来。
B：OK, I'm coming. 好，我就来。(若用 Oh, I'm going. 对方可能会理解为“噢，我要出去”。)
一般说来，在这种情况有以下3点需注意：
(1) 表示到听话人(包括收信人)那儿去，通常用 come。如：
I'll come to see you one of these days. 过几天我来看你。
(2) 邀请对方一起去某地，可用 come 或 go。一般说来，用 come含有一种自己决定要去的意味，而用 go 则含有一种请求和商量的意味。如：
Would you like to come [go] with us? 你和我们一起去好吗?
(3) 表示“我同你一起去”这样的意义时，可用 come 或 go。如：
I will come [go] with you. 我和你一起去。
【篇二】2021年上半年英语四级语法用法详解
1. Raise和rise都有“上升”的意思，记住下面2句话：
Raise是及物动词，后面必须有宾语，就是“某人把某物举起来”。
Rise是不及物动词，后面不能加宾语，也就是说“某人、某物自己升起来”。
比如：
He raised his right hand. 他举起了右手。(是他把手举起来的，所以用raise)
I raised the box above my head. 我把盒子举过了头顶。(盒子是我举起的，所以用raise)
The waves rose and fell. 波浪起起伏伏。(波浪是自己动的，所以用rise)
Smoke rose into the sky. 空中升起了烟。(烟也是自己飘的，所以用rise)
2. Raise和rise都有“增长”的意思，同样地：
Raise是及物动词，后面必须有宾语。
Rise是不及物动词，后面不能加宾语。
比如：
We will have to raise our fees. 我们需要提高费用。(raise后面一定要有宾语)
Prices are rising rapidly. 价格快速上涨。(rise后面一定不能有宾语)
3. 在英式英语里，raise只能作动词、不能做名词，rise既可以作动词、也可以作名词
比如：He asked for a pay rise.
在美语里，raise则可以作名词，表示“加薪”。
比如：She offered me a raise.
明白了吗?填空——>
We ___ our heads to watch the sun ___ over the bridge.
你觉得是A. raise / rise 还是B. rise / raise 呢?
We raised our heads to watch the sun rise over the bridge. 我们抬起头，望着太阳从桥上升起。(我们的头当然要我们抬起来，所以用raise;太阳是自己升升落落的，所以用rise。)
【篇三】2021年上半年英语四级语法用法详解
(1)prepare sb. for / to do sth.使某人对……作好准备
The teacher are preparing the students for the final examination.老师们正让学生准备期末考试。
The mother prepared her son to go to preschool.妈妈让儿子准备好去学前班。
(2)prepare sb. sth.为某人准备……
The host and hostress prepared us a delicious meal.主人为我们准备好美味佳肴。
(3)prepare sth. for + n. / v.-ing.(动名词)准备……，为……做准备
The peasants are preparing the ground for planting.农民们正在为栽种准备耕地。
(4)sb. prepare for sth. / to do sth.某人准备做……
The students are busy preparing for the college entrance examination.学生们正忙着准备考大学。
(5)be prepared for…为……准备，对……作好了准备，表示结果
The students are well prepared for the sports meeting.学生们为运动会做了充分准备。Prepare的用法及搭配详解
They were not prepared for the attack at all.他们根本没有预料到这次袭击。
(6)be prepared to do sth.准备好……，愿意
Always be prepared to answer questions in class.课堂上要时刻准备回答问题。
(7)be prepared against防备
We are prepared against natural disasters.我们作好预防自然灾害的准备。
C. 2021年6月英语四级语法用法辨析3篇
【 #四六级考试# 导语】中国有“书读百遍，其义自见”的古谚，一直在郑敏磨强调重复练习的重要性。2021年考试日益临近，多看书，勤做题是大有裨益的。 考 网！【篇一】2021年6月英语四级语法用法辨析
1. 在系表结构后接不定式时，不能按汉语意思用“人”作主语，而用形式主语it。
如：
他有必要同我们一走去。
误：He's necessary to go with us.
正：It's necessary for him to go with us.
正：It's necessary that he (should) go with us.
在以上后接 that 从句的句型中，从句谓语通常要用虚拟语气。
又如：
It's necessary that he (should) buy a computer.
他有必要买台电脑。
It's necessary that we (should) ask for her advice.
我们有必要去征求一下她的意见。
2. 表示“对……有必要”，其后可接介词 to 或 for。
如：
Food is necessary for [to] life.
食物对生命是必要的。
Sleep is necessary to [for] one's health.
睡眠对健康是喊斗必不可少的。
当后接不拿宽定式的复合结构时，引导不定式逻辑主语的介词通常只用for而不用 to。
如：
It's necessary for us learn a foreign language.
我们有必要学习一门外语。
3. 可与 if, when, where, as, whenever, wherever, although等连词构成省略句(可以看成是其中省略了it is)。
如：
If necessary, ring me at home.
如果必要，可往我家里打电话。
Tell him all about it when necessary.
在必须的时候把一切都告诉他。
Where necessary, improvements will be made.
哪儿需要，就在哪儿改进。
They believed in the application of force wherever necessary.
凡属必要的地方他们都主张使用武力。
另外，注意习语as necessary(按需要，根据需要)，than necessary(比需要的更)。
如：
We'll be adding more workers as necessary. 我们会按需要增加更多的工人。
I drove ten miles farther than necessary. 我开车开过了10英里。
【篇二】2021年6月英语四级语法用法辨析
1. 与 can, be able to 等连用，表示“担负得起”某事或某物的费用、损失、后果等，或表示“抽得出”时间等，后面通常可接名词、代词、不定式等(多用于否定句或疑问句)。如：
I can't afford (to buy) a new coat. 我没钱买件新外衣。
He can't afford the time for it. 他抽不出时间来做此事。
He says he really can't afford to wait another day. 他说他确实一天也不能再等了。
2. 表示“提供”“给予”，其后可以接双宾语(直接宾语通常为抽象概念)，若双宾语交换位置，要用介词 to(此时无需连用 can, be able to等)。如：
他的来访给我们带来极大的快乐。
正：His visit affords us great pleasure.
正：His visit affords great pleasure to us.
【篇三】2021年6月英语四级语法用法辨析
owever与but 的用法区别
两者均可表示转折或对比，意为“但是”、“可是”、“然而”等，但有区别：
1. 表示转折时，but 是连词。如：
He is young but very experienced. 他虽年轻，但经验很丰富。
He has three daughters but no sons. 他有3 个女儿，但没有儿子。
He likes sports, but his wife likes music. 他喜欢运动，而他妻子则喜欢音乐。
2. however 表示“然而”、“可是”时，有的词书认为它是连词，有的词书认为它是副词。之所以将其视为副词，也许是因为像许多副词一样不仅能位于句首，而且能位于句中(注意前后使用逗号)，甚至句末 (注意其前也用逗号)。如：
Later, however, he changed his mind. 可是他后来改变了主意。
He hasn't arrived. He may, however, come later. 他还没有到，不过他等会儿可能会来。
He said that it was so; he was mistaken, however. 他说情况如此，可是他错了。
注：以上各例中的 however 不能换成 but，但可用 but 来改写。如：
He said that it was so, but he was mistaken. 他说情况如此，可他错了。
3. 当连接两个句子时，其前通常应用分号，或另起新句。如：
It's raining hard; however, I think we should go out. / It's raining hard. However, I think we should go out. 雨下得很大，但我想我们还得出去。
注：上例中的 however 不能换成 but，但可用 but 来改写 (注意所用标点的变化)。如：
It's raining hard, but I think we should go out.
D. 大学英语四级语法指导
五篇大学英语四级语法指导
篇一： 大学英语四级语法指导
倒装的六条原则：
1. so放在句首时表示承前肯定，这个句子用部分倒装;
nor， neither放在句首时表示承前否定，句子也用部分倒装;
2. 省略了引导词if 的虚拟条件从句，可以把从句中的had， should， could， were中的任何一个提到从句最前面的位置，构成部分倒装;
3. as， though表示“尽管”时引导从句，从句中的表语可以置于引导词之前构成部分倒装;
系动词后面的部分就是表语，形容词、名词、名词性短语可以置于系动词之后。
例如：She is beautiful. They are students.
四级考试中出现的是由动词的过去分词转变的形容词作表语的形式。
例、 _B_ as it was at such a time， his work attracted much attention.
A Being published B Published C Publishing D To be published
当题干是as引导一个从句，且as前为一个空格时他表示的就是尽管，空格处要填的就是表语。
being published 正在被出版; to be published 将要被出版。
此句恢复正常语序应为： As it was published at such a time …
4. 表示否定含义的单词或短语放在句首，句子用部分倒装;
常见的一些表示否定含义的单词：never， little， few， hardly (… when)， scarcely (… when) ;
seldom 难得，不常;nowhere 哪里都不。
常见的一些表示否定含义的短语：in no way 决不; on no account 决不;
under no circumstances 在任何情况下都不。
5. only + 状语放在句首，句子用部分倒装;(如果only去掉就是全部倒装)
例、Only under special circumstances _C_ to take make-up tests.
A permitted are freshmen B freshmen are permitted
C are freshmen permitted D are permitted freshmen
freshmen 新生; make up for 弥补，补偿; make-up tests 补考(缓考)。
6. 注意两个表达形式：come what may 无论发生什么情况; say what you will 畅所欲言。
篇二：大学英语四级语法指导
1. The children went there to watch the iron tower _D_.
A to erect B be erected C erecting D being erected
watch 看电视用，看比赛用; see 看电影用;
感官动词watch， see， hear; 感官动词 + 名词(代词)+ do
be erected 强调的是动作的结果; being erected 强调的是动作的过程。
2. The engine _D_ smoke and steam.
A gives up B gives in C gives away D gives off
give up 放弃; give in 屈服，让步; give off 释放，放出(烟和气体);
give away 泄露，走漏风声;婚礼中新郎的父亲把新娘的手交给新郎的过程;赠送礼品。
3. The manager promised to keep me _C_ of how our business was going on.
A to be informed B on informing C informed D informing
keep sb. + 分词; inform v. 通知，告知; inform sb. of sth. 通知某人某件事情
keep me informed 使我被告知。
4. The goals _B_ he had fought all his life no longer seemed important to him.
A after which B for which C with which D at which
fight with sb. (注意要看整个句子); fight with + 工具 用该工具来打仗。 fight for 为…而战。
I fight with him. 我和他打起来了。 I fight with him against her. 我和他并肩对付她。
5. They _C_ in spite of the extremely difficult conditions.
A carried out B carried off C carried on D carried forward
in spite of 尽管; carry on 坚持，继续。
6. I should like to rent a house， modern， comfortable and _B_ in a quiet neighborhood.
A all in all B above all C after all D over all
all in all 总而言之;above all 首先，尤其是;after all 毕竟，终究;overall 全面的，总体的
in a word 总之，in short 简而言之，in conclusion 最后，总之，to sum up总之，总而言之。
7. _B_ we have finished the course， we shall start doing more revision work.
A For now B Now that C Ever since D By now
now that 既然，由于(相当于since); ever since 自从…以来。
与that搭配且后面可以加句子的几个表达形式：
now that 既然，由于; in that 因为; except that 除…之外。
except后面加名词或代词;except that后面加句子。
8. What you have done is _D_ the doctor’s orders.
A attached to B responsible to C resistant to D contrary to
be attached to 连接，附属; This school is attached to Beida. 这所学校附属于北大。
responsible to 对…负有责任; resistant adj. 反抗的，抵抗的; water resistant 防水的。
be contrary to 与。。相反(相违背)。
9. John regretted _A_ to the meeting last week.
A not going B not to go C not having been going D not to be going
regret doing 后悔做过某事; regret to do sth. 遗憾的做某事(应用语境非常有限)。
10. We regret to inform you that the materials you ordered are _B_.
A out of work B out of stock C out of reach D out of practice
out of work 失业; out of reach 够不着 within reach 够得着; out of practice 缺乏练习。
篇三：大学英语四级语法指导
动名词的复合结构：凡是一个动词的后面可以加动名词，就可以加动名词的复合结构。
动作发出者 + 动名词;当动作发出者名字给出时：名词所有格 + 动名词;当动名词的复合结构在文章中出现，且动作发出者在前文中提过时：形容词物主代词(宾格)+ 动名词。
形容词物主代词：his， her， my， your， their， our。代词宾格：him， her， me， you， us， them。
第二点：want 想要; want to do sth. 想做某事; want doing 客观需要或缺乏。
例. Your hair wants _B_. You’d better have it done tomorrow.
A cut B cutting C to cut D being cut
注意：want doing 中doing表示的是被动含义。
例. This room is so dirty that it wants _A_.
A cleaning B to clean C being cleaned D cleaned
第三点：mean 意味; mean to do sth. 打算做某事，意欲… ;mean doing 意味着，…的意思是…
例. There’s a man at the reception desk who seems very angry and I think he means _B_ trouble. [reception desk 接待台]
A making B to make C to have made D having made
1. The children went there to watch the iron tower _D_.
A to erect B be erected C erecting D being erected
watch 看电视用，看比赛用; see 看电影用;
感官动词watch， see， hear; 感官动词 + 名词(代词)+ do
be erected 强调的是动作的结果; being erected 强调的是动作的'过程。
2. The engine _D_ smoke and steam.
A gives up B gives in C gives away D gives off
give up 放弃; give in 屈服，让步; give off 释放，放出(烟和气体);
give away 泄露，走漏风声;婚礼中新郎的父亲把新娘的手交给新郎的过程;赠送礼品。
3. The manager promised to keep me _C_ of how our business was going on.
A to be informed B on informing C informed D informing
keep sb. + 分词; inform v. 通知，告知; inform sb. of sth. 通知某人某件事情
keep me informed 使我被告知。
4. The goals _B_ he had fought all his life no longer seemed important to him.
A after which B for which C with which D at which
fight with sb. (注意要看整个句子); fight with + 工具 用该工具来打仗。 fight for 为…而战。
I fight with him. 我和他打起来了。 I fight with him against her. 我和他并肩对付她。
5. They _C_ in spite of the extremely difficult conditions.
A carried out B carried off C carried on D carried forward
in spite of 尽管; carry on 坚持，继续。
篇四：大学英语四级语法指导
短语部分没有独立主语，则短语结构称为非谓语动词。
非谓语动词的结构：分词(分词短语)
句子的主语决定非谓语动词中的分词是用主动还是被动形式。如果是句子的主语发出动作，则使用现在分词;如果动作不是由句子的主语发出，则使用过去分词。
1.No matter how frequently _A_， the works of Beethoven always attract large audiences.
A performed B performing C to be performed D being performed
perform vt. 表演，演出，演奏;
to be performed 将要被演奏; being performed 正在被演奏;
一些特殊的动词：
第一点：forget 忘记; [反义] remember 记得;
这两个词后加动词不定式表示将要进行的行为;这两个词后加动词ing形式表示已经做过的事情。
注意：动名词与现在分词形式一样，但含义不同。这两个词后加动词ing形式都是动名词。
forget to do sth. 忘记要去做某事; forget doing sth. 忘记做过某事;
remember to do sth. 记得要去做某事; remember doing sth. 记得做过某事;
2. I remember _B_ to help us if we ever got into trouble.
A once offering B him once offering C him to offer D to offer him
offer vt. 提出，提供; offer sb. sth. / offer to do sth.
him once offering 如果改成 his once offering 也正确。
动名词的复合结构：凡是一个动词的后面可以加动名词，就可以加动名词的复合结构。
动作发出者 + 动名词;当动作发出者名字给出时：名词所有格 + 动名词;当动名词的复合结构在文章中出现，且动作发出者在前文中提过时：形容词物主代词(宾格)+ 动名词。
形容词物主代词：his， her， my， your， their， our。代词宾格：him， her， me， you， us， them。
第二点：want 想要; want to do sth. 想做某事; want doing 客观需要或缺乏。
例. Your hair wants _B_. You’d better have it done tomorrow.
A cut B cutting C to cut D being cut
1. The children went there to watch the iron tower _D_.
A to erect B be erected C erecting D being erected
watch 看电视用，看比赛用; see 看电影用;
感官动词watch， see， hear; 感官动词 + 名词(代词)+ do
be erected 强调的是动作的结果; being erected 强调的是动作的过程。
2. The engine _D_ smoke and steam.
A gives up B gives in C gives away D gives off
give up 放弃; give in 屈服，让步; give off 释放，放出(烟和气体);
give away 泄露，走漏风声;婚礼中新郎的父亲把新娘的手交给新郎的过程;赠送礼品。
3. The manager promised to keep me _C_ of how our business was going on.
A to be informed B on informing C informed D informing
keep sb. + 分词; inform v. 通知，告知; inform sb. of sth. 通知某人某件事情
keep me informed 使我被告知。
4. The goals _B_ he had fought all his life no longer seemed important to him.
A after which B for which C with which D at which
fight with sb. (注意要看整个句子); fight with + 工具 用该工具来打仗。 fight for 为…而战。
I fight with him. 我和他打起来了。 I fight with him against her. 我和他并肩对付她。
5. They _C_ in spite of the extremely difficult conditions.
A carried out B carried off C carried on D carried forward
in spite of 尽管; carry on 坚持，继续。
注意：want doing 中doing表示的是被动含义。
例. This room is so dirty that it wants _A_.
A cleaning B to clean C being cleaned D cleaned
第三点：mean 意味; mean to do sth. 打算做某事，意欲… ;mean doing 意味着，…的意思是…
例. There’s a man at the reception desk who seems very angry and I think he means _B_ trouble. [reception desk 接待台]
A making B to make C to have made D having made
篇五：大学英语四级语法指导
非谓语动词与独立主格：短语，句子(或者句子，短语)
当短语部分有独立主语，并且该主语不同于句子主语，这时短语结构称为独立主格。(它最明显的特点是短语部分有独立的主语)。
独立主格的结构1：名词(代词)+ 分词 [现在分词、过去分词]
现在分词表示主动的，正在进行的行为;过去分词表示被动的，已经完成的行为。 作题时要通过判断动作与名词(代词)之间的关系来确定是使用现在分词还是过去分词。当动作由名词(代词)发出时使用现在分词，而名词(代词)是受动者时则用过去分词。
1. Silver is the best conctor of electricity， copper _B_ it closely.
A followed B following C to follow D being followed
2. All things _A_， the planned trip will have to be called off.
A considered B be considered C considering D having considered
call off 取消; cancel vt. 取消; 四级中的考点就是现在分词和过去分词的区别。
独立主格的结构2：with + 名词(代词)+ 分词 [句子当中作状语]
3. After the Arab states won independence， great emphasis was laid on expanding ecation， with girls as well as boys _C_ to go to school.
A to be encouraged B been encouraged C being encouraged D be encouraged
as well as 和(相当于and); be encouraged不会考。
动词不定式有预示将来行为的含义。to be encouraged 将要被鼓励;
been encouraged 已经被鼓励完了，与主句的谓语动词相对;being encouraged 正在被鼓励
短语部分没有独立主语，则短语结构称为非谓语动词。
非谓语动词的结构：分词(分词短语)
句子的主语决定非谓语动词中的分词是用主动还是被动形式。如果是句子的主语发出动作，则使用现在分词;如果动作不是由句子的主语发出，则使用过去分词。
1.No matter how frequently _A_， the works of Beethoven always attract large audiences.
A performed B performing C to be performed D being performed
perform vt. 表演，演出，演奏;
to be performed 将要被演奏; being performed 正在被演奏;
一些特殊的动词：
第一点：forget 忘记; [反义] remember 记得;
这两个词后加动词不定式表示将要进行的行为;这两个词后加动词ing形式表示已经做过的事情。
注意：动名词与现在分词形式一样，但含义不同。这两个词后加动词ing形式都是动名词。
forget to do sth. 忘记要去做某事; forget doing sth. 忘记做过某事;
remember to do sth. 记得要去做某事; remember doing sth. 记得做过某事;
2. I remember _B_ to help us if we ever got into trouble.
A once offering B him once offering C him to offer D to offer him
offer vt. 提出，提供; offer sb. sth. / offer to do sth.
him once offering 如果改成 his once offering 也正确。
;E. 2020年12月英语四级语法用法讲解
【 #四六级考试# 导语】可以开始进行2020年考试备考啦，迎战考试，奋斗是我们此刻的选择，相信所有的努力都会被岁月温柔以待！以下为“2020年12月英语四级语法用法讲解”，欢迎阅读参考！更多相关讯息请关注 ！【篇一】2020年12月英语四级语法用法讲解
英语四级语法用法辨析：keen on doing sth 与keen to do sth 的区别
1)keen on doing sth 通常表示“喜欢做某事”，指的是一种兴趣爱好。如：
The painter is keen on collecting coins 那位画家喜欢收集硬币。
I’m not keen on gambling. I’m too afraid of losing. 我对赌博不感兴趣。我太怕输了。
动名词前有时有逻辑主语：
Mrs Hill is keen on Tom’s marrying Susan. 希尔太太很希望汤姆能和苏珊结婚。
但有时也表示“渴望做某事”，如《朗文多功能分类词典》中就有这样一句：
I’m keen on passing this examination. 我渴望通过这次考试。
2)keen to do sth 主要表示“很想做某事”“渴望做某事”。如：
I’m not keen to go again. 我不太想再去了。
He’s keen to see his birthplace again. 他很想重见他的出生地。
She’s keen to get ahead in her career. 她热望在事业上出人头地。
She’s keen to get in on any discussions about the new project. 她一心想参加有关新计画的讨论。
The airline is keen to improve passenger comfort. 该航空公司致力于改善旅客的舒适程度。
Doctors are keen to highlight this little-known disease. 医生们渴望把注渣碧晌意力集中在这一鲜为人知的疾病上。
3)有时不定式可以带有逻辑主语，说成keen for sb to do sth(很想某人做某事，渴望某人做某事)。如：
Parents are always keen for their children to get on. 父母总是热望子女有出息。
【如锋篇二】2020年12月英语四级语法用法讲解
英语四级语法用法辨析：until 后接过去分词
请看这道题，这个until 后要接过去分词吗?
He is a man of few words, and seldom speaks until _________ to.
A. spoken B. speaking C. speak D. be spoken
【分析】此题容易误B，认为until 是介词，后接动词时用动名词形式。其实，此题应选A，until spoken to 为 until he is spoken to 之省略。句意为“他是个沉默寡言的人，别人不同他说话，他很少同别人说话”。按英语习惯，一些表示时间、地点、条件、方式、 让步慧春等的状语从句，若其主语与主句主语一致，且从句谓语包含动词be, 那么可将从句的主语和动词be省略：
You must study hard while (you are) young, or you will regret when (you are) old. 趁年轻时要努力学习，不然到老了你会后悔的。
I won't go unless (I am) invited. 我不会去, 除非请我。
Look out for cars when (you are) crossing the streets. 过马路时要注意汽车。
While (I was) waiting I was reading some old magazines. 等的时候我在看一些旧杂志。
He worked very hard though (he was) still rather poor in health. 尽管身体还不好，但他仍努力工作。
He will work hard wherever (he is) sent by the Party. 无论党把他派往哪里,他都会努力工作。
请再看两道试题：
(1) If carefully _________, the experiment will be successful.
A. do B. does C. done D. doing
答案选C，可视为 if it is carefully done 之省略。
(2) The research is so designed that once _________ nothing can be done to change it.
A. begins B. having begun C. beginning D. begun
答案选D，可视为 once it is begun 之省略。
【篇三】2020年12月英语四级语法用法讲解
英语四级语法用法辨析：介词below与under的用法区别
1. 两者都可表示“低于”，under 主要表示垂直在下的正下方，而 below 则不一定表示正下方(即可以是正下方或非正下方)。如：
Look in the cupboard below [under] the sink. 到洗碗池下面的柜子里找一找。
The climbers stopped 300 meters below the top of the mountain. 登山队员们在离山顶 300 米处停了下来。
换句话说，表示正下方，两者都可用;不表示正下方，则通常用below。
2. 两者均可表示数量方面的“少于”，但在现代英语中，以用 under 为多见。如：
He can't be much below [under] sixty. 他的年龄不可能比 60 岁小很多。
There were under forty people at the meeting. 参加会议的人不足 40 人。
It took us under an hour. 我们用了不到 1 个小时。
注：在现代英语中，below 表示“少于”，主要用于表示温度、高度以及有纵向标准可比的情况。如：
This place is below sea level. 此地在海平面以下。
The temperature is two degrees below zero. 温度是零下 2 度。
3. 若表示一物被另一物所覆盖，则通常用 under。如：
She crept in beside him under the bedclothes. 她钻进被窝躺在他身旁。
4. 表示职位、级别等关系时，用 under 表直接关系，用 below 表非直接关系。比较：
Mr A is under Mr B. A 先生是 B 先生的部下。
Mr A is below Mr B. A 先生比 B 先生职位低。