--No, you neednt. / No, you dont have to.
2)mustnt 表禁止、不允许。
You mustnt talk to her like that.
3)表示揣测。意为想必、准是、一定等,只用于肯定句。否定、疑问句中must改为can .
He must be ill. He looks so pale.
Shes wearing a diamond necklace. She must have a lot of money.
注:must表推测时,其反义疑问句与must后面的动词一致。
There must be something wrong ,____ ____?
4.need的用法
need既可用作情态动词,也可用作实义动词。用作情态动词时,主要否定句或疑问句中。用作实义动词时,可用于各种句式。
1).用作情态动词,用于否定句和疑问句中。
a).Need I .? Yes , you must / No, you neednt .
Need we finish the work today ?Yes you __?
A.need B.can C. may D.must
b).need + do sth . 变否定句:neednt do sth
变疑问句:Need sb do sth ?
2).用作实义动词
a).need + to do sth . We need _______(buy) some school things .
变否定句:dont /doesnt /didnt +need to do sth .
变疑问句:Do / Does /Did sb + need to sth ?
Yes , do/ does / did No, sb dont / doesnt /didnt .
You dont need to do it yourself.
b).当主语是物时。Sth + need + doing sth = Sth +need to be done .
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