what must he do?这句话中,如果把第三人称变了,变成they.那么是不是what must they do后面的do 是不是无论是什么人称都不变成does

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what must he do?这句话中,如果把第三人称变了,变成they.那么是不是what must they do后面的do 是不是无论是什么人称都不变成does

what must he do?这句话中,如果把第三人称变了,变成they.那么是不是what must they do后面的do 是不是无论是什么人称都不变成does
what must he do?
这句话中,如果把第三人称变了,变成they.那么是不是what must they do
后面的do 是不是无论是什么人称都不变成does

what must he do?这句话中,如果把第三人称变了,变成they.那么是不是what must they do后面的do 是不是无论是什么人称都不变成does
可以把这句话改为称述句就是:He must do someting.
因为must是情态动词,后面一定要接动词原形,所以无论是单数还是复数,do都是原形,不能变成单数,也不能变成过去式或过去分词.

是的,因为前面有一个must了,他后面的动词 助动词 都用原型

在这种情况下,是的,因为前面有情态动词must,后面的动词必须用原形.

must 是情态动词 后面动词用原型
===================
must1
KK: []
DJ: []
v.aux.
1. (表示必要、命令或强制)必须,得
You mustn't talk like that.
你可不能这样说话。
You must do as you are told.
你必须遵嘱行事...

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must 是情态动词 后面动词用原型
===================
must1
KK: []
DJ: []
v.aux.
1. (表示必要、命令或强制)必须,得
You mustn't talk like that.
你可不能这样说话。
You must do as you are told.
你必须遵嘱行事。
We must be home by six.
我们必须在六点以前回家。
2. (表示肯定的推测)一定是,谅必,八成
This must be your room.
这一定是你的房间了。
He must be eighty now.
他现在八成有八十岁了。
3. (表示不可避免性)必然要,必定会
All men must die.
人总有一死。
4. (表示主张)一定要,坚持要
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。
5. (表示与说话人愿望相反)偏要
The machine must break down at this busy hour.
正忙的时候机器偏偏坏了。
n.[S]
1. 必须做的事;不可少的事物
A walking stick is a must for me now.
如今我行走离不开手杖了。
2. 一定要看(或听、读)的东西
a.
1. 绝对必要的,必须的[B]

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