文档介绍：大学英语四级考试
语法难点总评
周雪

1. 时态
意义
条件从句
主句
与现在事实相反
动词一般过去式did
Should (would, could, might) +do
与过去事实相反
过去完成时had done
Should (would)+have+done
与将来事实相反
+不定式(were+to do) +动词原形
Should/would+do

要求
要求
要求
要求
ask
require
demand
insist
desire
maintain
propose
suggest
urge
advise
mend
move
command
order
demand
arrange
decide
例如:
It has been decided that the general meeting be postponed till next week.
3. 在形式主语的结构中
1) 在有特殊形容词的句套里
It is necessary that…
It is imperative that…
It is essential that…
It is important that…
It is strange that…
It is natural that…
It is desirable that…
It is incredible that…
It is advisable that…
2) 在有特殊名词的句套里
It is a pity that…
It is a shame that…
It is no wonder that…

suggestion,
proposal,
order,
request,
plan,
idea,
mendation,
motion
5. expect, believe, think, suspect 动词在否定或疑问形式重。
例如:
I never thought that she should be such a worldly girl.
6. If only, would (that), ’d rather (would rather, had rather) as if
例如:
If only I had not cheated at the exam.
Would (that) I were young again.
7. It is time 从句
It is high time…
It is about time you got up.

half of the
the rest of the
enough of the
单数名词
单数动词
复数名词
复数动词
lots of
heaps of
loads of
不可数名词
单数动词
复数可数名词
复数动词
a portion of
a series of
a group of
复数可数名词
单数动词