used to do sth
常見例句
- Sth . be used to do sth.
是固定詞組，意思是用來做某事。 - 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.
既不是陳述事實也不是描寫狀態(tài)，無法證實，但被說話者用來做事的。
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