10. repeated action 重复的动作：“will, would”
e.g. He would sit for hours doing nothing. 过去他常常坐几个钟头什么事也不做 。
He would come to see us on Sundays. 过去星期天他经常来看望我们 。
She will dance for hours. 她经常跳舞跳上几个小时 。
He will keep intruding. 他老是打扰别人 。
11. guessing 推测、猜测：“must, should, may / might, can / could, would, ought to”
e.g. He may be very busy now.
This must be your pen. / This can’t be your pen.
It would be about ten when he left home.
What would she be doing there?
I thought he would have told you all about it.
After such a long walk, you must be tired. 走了这么长的路,你一定困了 。
He must be the man I am looking for. 他一定是我要找的人 。
（A）情态动词表推测常用的三种句式：
1）在肯定句中一般用must (一定)，may（可能），might / could（也许，或许） 。
以上情态动词的语气按程度是依次递减的 。注意：might, could并非may, can的过去式，而表示语气较为委婉或可能性较小 。
e.g. He must / may / might know the answer to this question?
他一定 / 可能 / 也许知道这个问题的答案 。
It is cold in the room. They must have turned off the heating.
屋里很冷，他们肯定把暖气关了 。
2）否定句中用can’t / couldn’t (不可能), may not/might not (也许不会) 。
e.g. It can’t / couldn’t be the headmaster. He has gone to America.
这不可能是校长，他去美国了 。
He may not / might not know the scientist. 他也许不认识那位科学家 。
3）疑问句中用can/could (能……?) 。
e.g. Could he have finished the task? 他可能把任务完成了吗？
Can he be at home now? 他现在能在家吗？
（B）情态动词表推测常用的三种时态：
1）对将来情况的推测，用“情态动词 + 动词原形” 。
e.g. She must / may / might / could arrive before 5.5:00前她一定/可能/也许到 。
She must/may/might/could walk miles and miles among the hills without meeting anyone.
她一定/可能/也许会在山里一连走好几英里而遇不到一个人 。
2）对现在或一般情况的推测，用“情态动词 + be”，“情态动词 +be doing”或“情态动词 + 动词原形” 。
e.g. He must / may / might / could be listening to the radio now.
他一定/可能/也许正在听收音机 。
He can’t ( couldn’t ) / may ( might ) not be at home at this time.
这个时候他不可能/可能不在家 。
How can (could) he be late for the opening ceremony ?
布什先生一向准时，这次开幕式他怎么可能迟到呢？
It’s seven o’clock. Jack should/ought to be here at any moment.
现在七点钟了，杰克理应随时到达 。（推测）
3）对过去情况的推测用“情态动词 + have +过去分词” 。
e.g. It must / may / might / could have rained last night. The ground is wet.
地湿了，昨晚肯定/可能/也许下雨了 。
The door was locked. He can (could ) not / may ( might ) not have been at home.
门锁着，他不可能/可能不在家 。
Can / Could he have gotten the book？ 难道他找到书了吗？
Note: 虚拟语气:
e.g. They would be killed if the car went over the cliff.
如果汽车翻在悬崖下, 他们就会丧命 。
They would have been killed if the car had gone over the cliff.
如果汽车当时翻到悬崖下, 他们早就丧命了 。
She should / ought to have attended your birthday party, but she had to look after her mother in hospital.
她本该出席你的生日晚会的，可是她得在医院照顾她妈妈 。
Tom should not /ought not to have told me your secret, but he meant no harm.
汤姆本不该告诉我你的秘密，可是他并无恶意 。
He may not have finished the work.
(虚拟语气部分 Subjunctive Mood：See Chapter 16, 34)
12. dare和need的两重性: 情态动词和实义动词
1) need表示“需要”或“必须”，作情态动词时，仅用于否定句或疑问句中，在肯定句中一般用must, have to, ought to,或should代替 。如：
e.g. You needn’t come so early.
“— Need I finish the work today?
— Yes, you must.”
“needn't + 完成式” 表示本来不必做某事而实际上做了某事:
You needn't have waited for me for long. 没有必要等了我这么久 。
“-- Need I attend the meeting?
-- No, you need not have arrived so earlier.”
2) dare作情态动词时，主要用于疑问句、否定句和条件从句中，一般不用在肯定句中 。
e.g. How dare you say I'm unfair!
He daren't speak English before such a crowd, dare he?
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