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导读：
1.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)
2.情态动词+动词不定式完成结构的用法
could have done "本来可以……"(表示过去没有实现的可能)。
might have done"本来可能……;本来应该或可以做某事"(实际没有发生;含有轻微的责备语气。
should/ought to have done "本来该做某事"(而实际未做)
should not/ought not to have done "本来不该做"(实际却做过了，含有责备语气)
needn't have done "本来不必做"(但是已经做过了)
would rather have done "当时宁愿做了某事"(实际没有做过);否定式would rather not have done表达相反意思，两者都有表示"后悔"之意。
1. I`m an office worker. 我是上班族。
2. I work for the government. 我在政府机关做事。
3. I’m happy to meet you. 很高兴见到你。
4. I like your sense of humour. 我喜欢你的幽默感。
5. I’m glad to see you again. 很高兴再次见到你。
6. I’ll call you. 我会打电话给你。
7. I feel like sleeping/ taking a walk. 我想睡/散步。
8. I want something to eat. 我想吃点东西。
9. I need your help. 我需要你的帮助。
10. I would like to talk to you for a minute. 我想和你谈一下。
11. I have a lot of problems. 我有很多问题。
12. I hope our dreams come true. 我希望我们的梦想成真。
13. I’m looking forward to seeing you. 我期望见到你。
14. I’m supposed to go on a diet / get a raise. 我应该节食/涨工资。
15. I heard that you’re getting married. Congratulations.听说你要结婚了，恭喜!
(1)表语从句
1. 定义：用作表语的从句叫做表语从句。
2. 构成：关联词+简单句
3. 引导表语从句的关联词的种类：
(1) 从属连词that。如：
The trouble is that I have lost his address. 麻烦是我把他的地址丢了。
(2) 从属连词whether, as, as if。如：
He looked just as he had looked ten years before. 他看起来还与十年前一样。
The question is whether they will be able to help us. 问题是他们是否能帮我们。
注：从属连词if一般不用来引导表语从句，但as if却可引导表语从句，如：
All this was over twenty years ago, but it's as if it was only yesterday.
这都是20多年前的事了，但宛如昨天一样。
能跟表语从句的谓语动词一般为系动词be, seem, look等。如：
It looked as if it was going to rain. 看起来天要下雨了。
(3)连接代词who, whom, whose, what, which, whoever, whatever, whichever
连接副词 where, when, how, why。
如：The problem is who we can get to replace her. 问题是我们能找到谁去替换她呢。
The question is how he did it. 问题是他是如何做此事的。
That was what she did this morning on reaching the attic. 那就是她今晨上了阁楼干的。
解释：
1. 连词because可引导表语从句。如：
I think it is because you are doing too much. 我想这是因为你做得太多。
2. 在一些表示“建议、劝说、命令”的名词后面的表语从句中，谓语动词用虚拟语气。should+动词原形表示，should可省略。如：
My suggestion is that we (should) start early tomorrow. 我的建议是我们明天一早就出发。
(2)主语从句
1. 定义：用作主语的从句叫做主语从句。
2. 构成：关联词+简单句
3. 引导主语从句的关联词有三类：
(1) 从属连词that。 如：That they were in truth sisters was clear from the facial resemblance between them.
很明显，她们确是亲姐妹，她们的脸型很相似。
(2) 从属连词whether。如：
Whether he’ll come here isn’t clear. 他是否会来这里还不清楚。
(3) 连接代词who, whom, whose, what, which, whoever, whatever, whichever
连接副词 where, when, how, why。如：
What she did is not yet known. 她干了什么尚不清楚。
How this happened is not clear to anyone. 这事怎样发生的，谁也不清楚。
Whoever comes is welcome. 不论谁来都欢迎。
Wherever you are is my home ---- my only home. 你所在的任何地方就是我的家----我唯一的家。
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