四、在現(xiàn)在時態(tài)句里，用情態(tài)動詞(Modal Verb)的過去時態(tài)
(could,might,should,would)表示說話人的謙虛、客氣、有禮、委婉等：
1. Would you be kind enough to show me the way to the post office.
(情態(tài)動詞 would,表示客氣有禮)
2. It would be better for you not to stay up too late.(表示委婉)
