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該選must還是have to
作者:桑伯利  文章來(lái)源:本站原創(chuàng)  點(diǎn)擊數(shù)  更新時(shí)間:2010-04-18  文章錄入:admin  責(zé)任編輯:admin



該選must還是have to

 

請(qǐng)看這道題,選must還是have to

I haven’t got enough money to buy a ticketso I __________ go home on foot.

A. must                         B. have to                        C. ought to                         D. may

此題應(yīng)選B。從句意上看,只能選AB。關(guān)于must have to 表示“必須”時(shí)的區(qū)別,注意以下幾點(diǎn):

1. 強(qiáng)調(diào)重點(diǎn)不同:must強(qiáng)調(diào)主觀(guān); have to強(qiáng)調(diào)客觀(guān):

You must go now. (I want you to go now). 你必須現(xiàn)在就走(有“我要你現(xiàn)在走”之意)

If I buy that carI’ll have to borrow some money. 如果我要買(mǎi)那輛汽車(chē),我得借些錢(qián)。

2. 時(shí)態(tài)形式不同:一般說(shuō)來(lái),must 只有現(xiàn)在時(shí)一種形式(在賓語(yǔ)從句中可表示過(guò)去),而have to則有多種時(shí)態(tài)形式:

He said (that) she must go with me. 他說(shuō)她一定要同我一起去。

She had to go there on foot yesterday. 昨天她不得不步行去那兒。

He has had to buy a car. 他不得不買(mǎi)了輛小汽車(chē)(www.52ysedu.com)。

3. have to可以有分詞、動(dòng)名詞、不定式等非謂語(yǔ)形式,而must則沒(méi)有這些形式:

He only saw her in the eveninghaving to be away all day. 他因整天得外出,所以只能晚上見(jiàn)她。

I regret to have to trouble you again. 我很抱歉不得不再麻煩你一次。

4. 否定式的意義不同:must 的否定式mustn’t意為“不準(zhǔn)”、“不允許”;而 have to的否定式 don’t have to意為“不必”(=needn’t)

 

 

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