| ―I thought you wouldn’t mind. ―Well, as a matter of fact I don’t, but you _______ me first. |
| ―I called you yesterday. A woman answered, but I didn’t recognize her voice.―Oh, it _______ my aunt Jean. |
| That car nearly hit me; I _______. |
| He _______ the test again, in which case, his mother will be very disappointed. |
| ―Why didn’t she come to the meeting yesterday?―I’m not so sure. She _______ ill. |
| Why did you just sit and watch? You _______ me. |
| We _______ have proved great adventurers, but we have done the greatest march ever made in the past ten years. |
| ― I think I’ll give Bob a ring.― You _______. You haven’t been in touch with him for ages. |
| ― What’s the name?― Khulaifi. _______ I spell that for you? |
| If it were not for the fact that she _______ sing, I would invite her to the party. |
| ― Must he come to sign this paper himself?― Yes, he _______. |
| ―May I smoke here?―If you _______, choose a seat in the smoking section. |
| ― Could I have a word with you, mum?― Oh dear, if you _______. |
| We hope that as many people as possible _______ join us for the picnic tomorrow. |
| The weather turned out to be fine yesterday. I _______ the trouble to carry my umbrella with me. |
| The teacher _______ have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose. |
| My MP4 player isn’t in my bag. Where _______ I have put it? |
| The biggest problem for most plants, which ___ just get up and run away when threatened, is that animals like to eat them. |
| ― She looks very happy. She _______ have passed the exam.― I guess so. It’s not difficult after all. |
| I told your friend how to get to the hotel, but perhaps I _______ have driven her there. |
【答案解析】
1. should 后接动词完成式表示“本来应该做某事，结果未做”，此处含有责备之意。but you should have asked me first的意思是“你本来应该先问我一声的”。
2. 对过去情况的肯定推测，宜用“情态动词 + 动词完成式”，再根据句意，可确定答案。注：can 表示推测通常不用于肯定陈述句。
3. 表示过去可能发生而实际上未发生的事，用“might +动词完成式”，不用“may+动词完成式”。若只是推测过去可能已经发生的事，则可用“may [might] + 动词完成式”，如：He may [might] have gone. 他可能已经走了。
4. 根据下文的 will be 可知，“他考试不及格”是将来的事，据此可排除B和D。
5. 从时间上看，由于是昨天没来开会，所以推测“他生病”也应是昨天，故排除A和C。从语境上看，既然上文说I’m not so sure，那么说明说话者对自己的推测没有很大把握。
6. 根据上文的过去时态可知，此句谈的是过去的事，故排除A和C。You could have helped me的意思是“你本来可以帮帮我的（但你却没有帮）”。
7. 比较：needn’t have done意为“本来不必做某事”，may not have done意为“(过去)可能没有做某事”，shouldn’t have done意为“本来不应该做某事”(must表推测时不用于否定式)。
8. 将四个选项分别置于句中，比较句意的通顺性，便可知填什么最佳。
9. Shall I…? 意为“要我……吗？”，又如：Shall I help you? 要不要我帮你的忙? Do you want a bath at once, or shall I have mine first? 你马上洗澡还是我先洗?
10. 因为她“不会”唱歌，所以我才没有邀请她去参加晚会。
11. 以Must开头的疑问句，在作肯定回答时通常要用must或have to，如：Must we bring our passports with us? 我们必须带护照吗?—Yes, you must. 是的，你们必须要带。
12. must在此表示坚持或固执，又如：After I gave her my advice，she must go and do the opposite. 在我给她出主意之后她偏反着干。
13. must在此表示坚持或固执，if you must的意思是“如果你一定要说的话，你就说吧”。
14. can在此表示希望或建议，可译为“能够”“可以”，如：We can eat out if you like. 如你愿意，我们可以出去吃。
15. needn’t have done的意思是“本来不必做某事”(但实际上做了)。又如：You needn’t have been staying up so late. 你本来无需待到这么晚还不睡的。You needn’t have mentioned it. 你没有必要提及此事的。
16. “must+have+过去分词”表示对过去情况的肯定推测。句意为：我想，老师一定认为约翰逊是值得教的，要不然她就不会在他身上浪费时间了。
17. can在此表推测，“can+have+过去分词”表示对过去情况的推测，主要用于否定式或疑问句中。句意为：我的MP4不在包里，我会把它放到哪里去了呢？
18. can在此表示能力，can’t表示“不能”。此题所考查的知识点比较简单，但由于句子结构比较复杂，所以许多学生不是由于没有弄清知识点而误选，而是由于不理解句意而误选。全句意为：对于大多数植物来说，它们所面临的最大问题是(有些)动物喜欢以它们为食物，而当它们受到威胁时却不能起身逃跑。
19. “must+have+过去分词”表示对过去情况的肯定推测。由于“她看上去气色不错”，而且“考试也不难”，所以她一定是通过了考试。
20. 比较：“could+have+过去分词”的意思是“本来可以”“本来应该”“本来能够”；“must+have+过去分词”的意思是“一定已经”；“might+have+过去分词”的意思是“本来可以”“本来可能”；“should+have+过去分词”的意思是“本来应该”。
