【简明语法】21.4 比较have to和must
时间:2019-02-08 作者:英语课 分类:英文语法词汇
英语课
1) 两词都是'必须'的意思,have to 表示客观的需要, must 表示说话人主观上的看法,既主观上的必要。
My brother was 1 very ill, so I had 2 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 3 that they must work hard. 他说他们必须努力工作。(主观上要做这件事)
2) have to有人称、数、时态的变化,而must只有一种形式。但must 可用于间接引语中表示过去的必要或义务。
He had to look after his sister yesterday.
3) 在否定结构中: 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诉他。
You mustn't tell him about it. 你一定不要把这件事告诉他。
点击收听单词发音
1
was
v.(is,am的过去式)是,在
参考例句:
He said he was right.他说他是正确的。
He was cold and hungry.他又冷又饿。
2
had
vbl.have的过去式和过去分词;conj.有
参考例句:
I just had a good idea!我有个好主意!
The boy had a small branch of a tree in his hand.这个男孩手上拿一条小树枝。
3
said
v.动词say的过去式、过去分词
参考例句:
He said to me that he could not come.他对我说他不能来。
He said to his mother that he would do it by himself.他对他的母亲说他将自己独立做那件事。
vbl.have的过去式和过去分词;conj.有
- I just had a good idea!我有个好主意!
- The boy had a small branch of a tree in his hand.这个男孩手上拿一条小树枝。