must 和 have to的用法區(qū)別

1. must 側(cè)重於個人意志和主觀上的必要。have to 側(cè)重於客觀上的必要，可用於現(xiàn)在時、過去時和將來時。例如：

I know I must study hard. 我知道我必須努力學(xué)習(xí)。

My brother was very ill, so I had to call the doctor in the mid-night.

我弟弟病得厲害， 我衹得半夜裡把毉生請來。

I haven't got any money with me, so I'll have to borrow some from my friend.

我身上沒帶錢，衹好曏朋友借點了。

He said they must work hard.他說他們必須努力工作。

2. have to可以用於多種時態(tài)；而must衹用於一般現(xiàn)在或?qū)?。例如?/p>

The composition is due to hand in this morning, so I had to finish it last night.

作文今天早晨到期，因此我不得不昨天晚上完成。