英语整理《小升初英语语法大全:情态动词must与have to的用法》,供大家参考学习~
must 的用法
一、表义务,必须。例如:
You must talk to them about their study. 你必须同他们谈谈关于他们学习的事。
二、在否定结构中表不许。例如:
You mustnt leave here. 你不能离开这儿。
三、表推测,暗含有很大的可能性。例如:
He must be ill. He looks so pale. 他肯定是病了。他的脸色那么苍白。
注意:之前我们说过 may 也可以表猜测,但是 may 暗含的可能性较小,must 暗含的可能性较大。另外否定的猜测是用cant。例如:
The baby cant be ill. He is so active. 那宝宝不大可能是病了。他那么活跃。
四、表不可避免,必然要,必定会。例如:
All men must die. 人总有一死。
五、表主张,坚持要,一定要。例如:
If you must go, at least wait till the rain stops. 如果你坚持要走,至少也要等雨停了再走。
六、关于 must 的简短回答:
-Must I clean the dining room at once? 我必须马上打扫膳厅吗?
-Yes, you must. 是的。
-No, you neednt. / No, you dont have to. 不必马上打扫。
have to 的用法
一、have to 表客观的需要和义务,must 表主观的认识。例如:
I missed the train, so I had to take a taxi. 我没搭上火车,所以我只得打的。(客观上需要打的)
I must study hard. 我必须努力学习。(主观上认为应该努力学习)
二、在疑问句和否定句中,have to 多用助动词 do 构成,must 则直接提前或加not。例如:
Did he have to do it? = Must he do it? 他得做那件事吗?
而且在否定句中,have to 表不需要,must 表不允许:
You dont have to go there. 你不需要去那儿。
You mustnt go there? 你不可去那儿。
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