used to do sth 过去常做某事 ; 过去经常做某事
be used to do sth 被用来做
get used to do sth 被用来做某事
Is used to do sth 现在习惯做某事
one used to do sth 某人过去经常做某事
was used to do sth 过去习惯于做某事
Sth . be used to do sth.
是固定词组，意思是用来做某事。
youdao
Perfomatives: are the sentences that did not state a fact or describe a state, and are not verifiable. But they are used by the speaker to do STH.
既不是陈述事实也不是描写状态，无法证实，但被说话者用来做事的。
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