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2017年專四英語(yǔ)語(yǔ)法考前輔導(dǎo)
自古以來(lái)學(xué)有建樹(shù)的人，都離不開(kāi)一個(gè)“苦”字。以下是小編為大家搜索整理的2017年專四英語(yǔ)語(yǔ)法考前輔導(dǎo)，希望能給大家?guī)?lái)幫助!更多精彩內(nèi)容請(qǐng)及時(shí)關(guān)注我們應(yīng)屆畢業(yè)生考試網(wǎng)!
have to 和must在表示“必須”這個(gè)意思時(shí)是很接近的，但也有一定的區(qū)別。
1. have to 比較強(qiáng)調(diào)客觀需要，表示因客觀環(huán)境或事態(tài)促使而不得不做某事;must強(qiáng)調(diào)主觀看法，表示主觀上認(rèn)為有必要做某事。例如：
I must learn another language.
(主觀想法: I want to)
I have to learn another language.
(客觀需要：身為一個(gè)外交官)
You must be back before 10 o'clock.
(叮囑或命令)
You have to be back before 10 o'clock because the train is to leave at 10:05.(客觀需要)
2. have to多表示義務(wù)或習(xí)慣動(dòng)作;must則用于表示一種重要或急迫的事情。例如：
We have to care for the young.(義務(wù))
She has to be at the office before eight every day. (習(xí)慣)
You must go to the manager at once, or you'll be dismissed.
務(wù)必馬上去見(jiàn)經(jīng)理，不然你會(huì)被開(kāi)除的。(急迫的事情)
3. have to可用于不同的時(shí)態(tài);而must一般只用于現(xiàn)在時(shí)(但也可以表示將來(lái)的情況，在間接引語(yǔ)中也可以表示過(guò)去時(shí))。例如：
I have to (must) leave now.
We'll have to buy another TV set.
They had to put off the sports meet because of the bad weather.
He said that the work must be finished within two weeks.
4. must還可以表示一種推斷和揣測(cè)，而have to則不能。例如：
This must be Jin's pen.
5. "must+動(dòng)詞完成式"可以用來(lái)表示對(duì)過(guò)去情況的揣測(cè)，而have to則不能。例如：
She must have read the book sometime in the past, or she couldn't have answered the question so well.
她一定在過(guò)去某個(gè)時(shí)候讀過(guò)這本書(shū)，不然，這個(gè)問(wèn)題她不會(huì)回答得這么好的。
Note:
在現(xiàn)代英語(yǔ)中，have to 中不定式和疑問(wèn)句式既可以按照助動(dòng)詞的變化規(guī)則構(gòu)成，也可以按照行為動(dòng)詞的變化規(guī)則構(gòu)成。例如：
Have you to finish the work before supper?
Do you have to finish the work before supper?
have got to 常可同have to換用，但有時(shí)表示不同的含義。比較：
He has to report to the headquarters every two days.(例行公事，習(xí)慣動(dòng)作)
He has got to report to the headquarters every two days.(一道指示或命令，必得每天報(bào)告一次)
另外，作“有”解時(shí)，have got和have通常是可以換用的，have got更口語(yǔ)化，但有時(shí)表示不同的含義。比較：
The man has a blind eye.那人有一只眼瞎了。
The man has got a blue eye.那人有一只眼被打青了。
must not表示禁止，是說(shuō)話人強(qiáng)有力的勸告或命令，意為“一定要，不準(zhǔn)”。因此，在回答由must引導(dǎo)的問(wèn)題時(shí)，如果是否定的回答，表示“不必，沒(méi)有必要”，不能用mustn't，而要用needn't或don't have to.試比較：
You must not drive fast.你不能開(kāi)快車。(路險(xiǎn)或有速度限制)
You needn't drive fast.(時(shí)間充裕)
翻譯下面兩個(gè)句子.
1. Though she didn't need to, she must go.
2.You don't have to come again, but you must.
答案：
Though she didn't need to, she must go.
雖然她不用去，她卻偏要去。
You don't have to come again, but you must.
你不必再來(lái)，可是你執(zhí)意要來(lái)。
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