问:变成否定句:I used to play the piano.答:1) I _____ to play the piano.2) I didn't use to play the piano.第二个我会做,请问第一个应该填什么呢?

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问:变成否定句:I used to play the piano.答:1) I _____ to play the piano.2) I didn't use to play the piano.第二个我会做,请问第一个应该填什么呢?
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问:变成否定句:I used to play the piano.答:1) I _____ to play the piano.2) I didn't use to play the piano.第二个我会做,请问第一个应该填什么呢?
问:变成否定句:I used to play the piano.
答:1) I _____ to play the piano.
2) I didn't use to play the piano.
第二个我会做,请问第一个应该填什么呢?

问:变成否定句:I used to play the piano.答:1) I _____ to play the piano.2) I didn't use to play the piano.第二个我会做,请问第一个应该填什么呢?
I used to do sth的否定句有两种形式
(1)I didn't use to do sth
(2)I usedn't to do sth
其中(2)中的usedn't=used not

usedn't

I usedn't to play the piano.

usen"t

usedn't

否定式:used not to do sth.
口语中:didn’t use to do sth.
(used not可缩写为usedn’t或usen’t.)

used not to