used to do sth
常见例句
- 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，無法証實，但被說話者用來做事的。
blog.sina.com.cn 返回 used to do sth