(1)be going to 表示近期、眼下就要發(fā)生的事情，will 表示的將來(lái)時(shí)間則較遠(yuǎn)一些。
He is going to write a letter tonight.He will write a book one day.
(2)be going to 表示根據(jù)主觀判斷將來(lái)肯定發(fā)生的事情，will表示客觀上將來(lái)勢(shì)必發(fā)生的事情。
He is seriously ill.He is going to die.He will be twenty years old.
(3)be going to 含有“計(jì)劃，準(zhǔn)備”的意思，而 will 則沒(méi)有這個(gè)意思。
如：She is going to lend us her book.He will be here in half an hour.
(4)在有條件從句的主句中，一般不用be going to， 而多用will。如：If any beasts comes at you， I'll stay with you and help you.
had better的用法
had better意為“最好”，沒(méi)有人稱的變化，后面接不帶to的不定式，其否定形式為：had better not。
如：We had better go now. 我們最好現(xiàn)在就走。
You had better not give the book to him.你最好不要把這本書(shū)給他。
02
含有情態(tài)動(dòng)詞的疑問(wèn)句的回答
1.對(duì)may引出的問(wèn)句，可以有下列回答方式：
Yes，you may.
Yes，of course.
Yes，certainly.
Sure.
No，you mustn’t. No， you can’t.
2.對(duì)must引出的疑問(wèn)句，回答方式為：
Yes，…must.
No，…needn't/ don't have to.
3.could在疑問(wèn)句中，表示委婉的語(yǔ)氣，此時(shí) could 沒(méi)有過(guò)去式的意思。
Could you do me a favour？ 你能幫我個(gè)忙嗎？
—Could I use your pen？ 我能用一下你的鋼筆嗎？
—Yes，you can.可以。（注意回答）
4.shall引出的疑問(wèn)句用于第一人稱，表示征求對(duì)方意見(jiàn)或客氣的請(qǐng)求。其回答方式有以下幾種：
Yes，please.
All right.
No，thank you.
5.would you…的回答方式有以下幾種：
Yes，I will. (No， I won't.)
Sure. (I’m sorry ， I can't.)
All right/ OK/ With pleasure.
Certainly. (No， thank you .)
Yes， please.
【例題】—Would you do me a favour and pass on my thanks to Lily？ —________.
A.That’s right B.With pleasure
C.It doesn’t matter D.No trouble
【解析】A. 意為“對(duì)了” ，B.意為“ 樂(lè)意效勞”， C. 意為“ 沒(méi)關(guān)系” D.意為“不費(fèi)事”。答案為B。
03
不同情態(tài)動(dòng)詞的否定意義也不同
1.can的否定式can't
(1)can't可譯為“不會(huì)”，如：I can't play basketball. 我不會(huì)打籃球。
(2)當(dāng)句子表推測(cè)時(shí)，用can’t 表達(dá)不可能，如：He can't be ill.He is playing chess with Tom.他不可能病了，他正和Tom下棋呢。
(3)can't 還可用來(lái)回答“ May I…？ ” 這樣的問(wèn)句。如：May I come in ？ 我可以進(jìn)來(lái)嗎？No， you mustn't. / can't. 不，你不能。
(4)can't 還可用于固定習(xí)語(yǔ)中。can't help doing 禁不住，…情不自禁… can't wait to do sth 迫不及待…如：She can't help crying. 她不禁大哭起來(lái)。The children can't wait to open the box. 孩子們迫不及待地想打開(kāi)盒子。
2.may的否定式為may not，譯成“ 可能不”，如：He may not be at home. 他也許不在家。
3.must的否定式mustn't
(1)mustn't表示不許，不可。
如：He mustn't leave his room.他不許離開(kāi)他的房間。
You mustn't talk in class. 你們不可以在課上說(shuō)話。
(2)mustn't也可用于以may表示要求時(shí)的否定回答中。
如：—May I stand here？我可以站在這里嗎？
—No， you mustn't (can't).不，不行。
4.need的否定式needn't
(1)needn't 意為“不必”。如：You needn't meet him unless you'd like to.你不需要見(jiàn)他，除非你愿意。
(2)needn't+have+動(dòng)詞的過(guò)去分詞，表不需要完成但已完成的動(dòng)作，暗含時(shí)間或精力上的浪費(fèi)。
如：You needn't have bought it. 你沒(méi)必要買(mǎi)它（但你卻買(mǎi)了）。
5.shouldn't表示不應(yīng)該。
如：You shouldn't feel so unhappy over such little things. 對(duì)于這種小事，你不應(yīng)該感到這么不高興。
04
情態(tài)動(dòng)詞的被動(dòng)語(yǔ)態(tài)
含有情態(tài)動(dòng)詞的被動(dòng)語(yǔ)態(tài)的結(jié)構(gòu)為：情態(tài)動(dòng)詞+be+done(動(dòng)詞的過(guò)去分詞)。
做題時(shí)要兼顧情態(tài)動(dòng)詞和被動(dòng)語(yǔ)態(tài)這兩個(gè)方面。
如：You needn't get up so early every day.你不必每天都起這么早。
She shouldn't speak to her mother in that way.她不應(yīng)該用那種方式和媽媽說(shuō)話。
More and more trees must be planted in China.在中國(guó)必須種植更多的樹(shù)木。
Many of the stars can not be seen because they are far away from us.很多星星我們都看不到，因?yàn)樗鼈冸x我們太遠(yuǎn)了。
1.“情態(tài)動(dòng)詞+動(dòng)詞原形”表示對(duì)現(xiàn)在的推測(cè)。
(1)can表示推測(cè)時(shí)一般用于否定句或疑問(wèn)句。
如：That man can't be her husbandshe is still single.
Who is knocking at the door？Can it be the postman？
(2)must表示肯定的推測(cè)，一般用于肯定句中。
如：He must be in his office now.
Mr Li must be working now，for the lights in his office are still on.
(3)might表示推測(cè)時(shí)不一定是may的過(guò)去時(shí)，只是表示其可能性較小。
如：The man may be the headmaster.
—Where is Mr Li？
—He might be working in his office.
—May Mr Li come？
—He might not come here.
(4)Could表示推測(cè)時(shí)，語(yǔ)氣can比要弱，說(shuō)話者留有余地。
如：—Could it be an animal？
—It could not be，because it is not moving.
(5)Should表示推測(cè)的可能性比較大，僅比must的可能性 小一點(diǎn)。如：It is already 10 o'clock now they should be there.
2.情態(tài)動(dòng)詞表示對(duì)過(guò)去可能發(fā)生的動(dòng)作或存在過(guò)的動(dòng)作的推測(cè)性用法。
(1)“must +have done/been”表示“過(guò)去一定發(fā)生過(guò)某事或存在過(guò)某種狀態(tài)”，不用于“musn’t+have”形式。
如：She must have seen the film before，hasn't she？(注意反意疑問(wèn)句的后半部分)
You must have met uncle Wang in the shop yesterday，didn't you？ (注意反意疑問(wèn)句的后半部分)
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