2020年12月大学英语四级答案|2020年12月大学英语四级重点语法知识三篇

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【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。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. if　　D. 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、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. When　B. 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、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.

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