2019年英语新同步译林必修四(江苏专用)讲义:Unit 2 Section Ⅳ Grammar & Writing Word版含答案
2019年英语新同步译林必修四(江苏专用)讲义:Unit 2 Section Ⅳ Grammar & Writing Word版含答案第4页

  He may be at home at the moment.

  他现在可能在家。

  She may not know about it.

  她可能不知道这件事。

  (3)用于表祝愿的句子中。

  May both the bride and groom have long and happy lives.

  祝新娘新郎幸福长寿。

  3.must (have to)

  (1)must表示必须,没有时态变化。强调的是一种主观看法,也表示责任或义务。have to表示"必须,不得不",是由于某种外界(客观)原因而"必须,不得不"做某事,也可表示经常的或习惯性的事"必须"做。mustn't表示禁止做某事;have to的否定形式表示"不必"。have to可用于多种时态中。

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

  我弟弟病得很厉害,我只得半夜里把医生请来。(客观上需要做这件事)

  He said that he must work hard.

  他说他必须努力工作。(主观上要做这件事)

  [名师点津] 回答must引出的疑问句时,如果是否定的回答,不能用mustn't,而要用needn't 或don't have to。

  -Must we hand in our exercise books now?

  -Yes, you must. (No, you needn't./No, you don't have to.)

  --我们现在就必须要交练习本吗?

  --是的,必须。(不,不必。)

  (2)must表示猜测。意为"想必,准是,一定"等,只用于肯定句。

  The book must be the one you want.

  这本书一定是你要的那本。

  She's wearing a diamond necklace. She must have a lot of money.

  她戴着钻石项链,一定很有钱。

  (3)must还可表示"偏要"。表示说话人不耐烦、不满的情绪。

  Why must it rain on Sunday?

  为什么偏要在星期天下雨?

   [即时演练2] 

  (1)用适当的情态动词填空

  ①My sister is ill; my mother has_to look after her.

  ②There's a lot of noise from next door. They must be having a party.

③-Must I return all the books in three days?