文档介绍：句型1
would rather that somebody did…
“宁愿……；更愿意……”（表示现在或将来的愿望）
would rather that somebody had done…
“宁愿……；更愿意……”（表示过去的愿望）
[例句]
I’d rather you posted the letter right now. 我想让你现在去寄信。
I’d rather that I hadn’t seen her yesterday. 我情愿昨天没有看到她。
句型2
as if/though+主语+did/had done…
好像……（表示现在或将来的情况用过去时；表示过去的情况用过去完成时）
[例句]
Our head teacher treats us as if we were her own children, so all the students in our class like her.
我们的班主任对待我们就像对待自己的孩子，所以班里所有的学生都很喜欢她。
Alan talked about Rome as if he had been there.
Alan谈起罗马来就好像他去过那里似的。
句型3
“wish+宾语从句”，表示不大可能实现的愿望。
表示现在的愿望：主语+过去时；
表示过去的愿望：主语+had done；
表示将来的愿望：主语+would/could do
[例句]
How I wish we students had more free time to relax ourselves!
我们学生多么希望有更多的自由时间放松自己！

句型4
It’s high/about time that somebody did(should do)
(should通常不省略) … 早就该……
[例句]
It’s time that you went to school.= It’s time that you should go to school.
你上学的时间到了。
It’s high time that we did something to improve our environment.
该是我们为环保做些事情了。
I think it’s high time that she made up her mind. 我想她该拿定主意了。

句型5
… before … “过了多久才……”或“动作进行到什么程度才……”。
[例句]
They walked about fifty miles to the west before they saw a village.
他们西行50英里才看到一个村庄。
The workers worked day and night about three days before everything returned to normal.
工人们连续工作3天才使一切恢复正常。
句型6
It was+时间段+before…“过了多久才（怎么样）……”
It was not long before…“不久，就……”
[例句]
It was five days