比較have to和must
2007-01-01 00:00
21.4 比較have to和must | ||
? | 1) 兩詞都是'必須'的意思,have to 表示客觀的需要, must 表示說(shuō)話人主觀上的看法,既主觀上的必要。 My brother was very ill, so I had to call the doctor in the middle of the night. 我弟弟病得很厲害,我只得半夜里把醫(yī)生請(qǐng)來(lái)。(客觀上需要做這件事) He said that they must work hard. 他說(shuō)他們必須努力工作。(主觀上要做這件事) 2) have to有人稱(chēng)、數(shù)、時(shí)態(tài)的變化,而must只有一種形式。但must 可用于間接引語(yǔ)中表示過(guò)去的必要或義務(wù)。 He had to look after his sister yesterday. 3) 在否定結(jié)構(gòu)中: don't have to 表示"不必" mustn't 表示"禁止", You don't have to tell him about it. 你不一定要把此事告訴他。 You mustn't tell him about it. 你一定不要把這件事告訴他。 |