(sb)+ used to doing :“过去常做--- ”
(sb)+be used to doing :“习惯于 ”
(sth)+be used to do“(某物)被用来做”
-Tom used to be short.
-Did Tom use to be short?
-Yes,he did./ No,he didn’t
I didn’t use to like tests.
You used to be short,didn’t you? / usedn’t you?
This kind wood is used to make desks.
He is used to staying up late in the night.
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