1. be supposed to do . 應(yīng)該 如：
We are supposed to stop smoking. 我們應(yīng)該停止吸煙。
知識拓展 表示應(yīng)該的詞有：should, ought to ,be supposed to
2. shake hands 握手 shake 本意是“搖動、震動”
3. You should have asked what you were supposed to wear.
你本應(yīng)該問清楚怎么樣穿才得體。中的“should have asked”是
“情態(tài)動詞＋現(xiàn)在完成時”表示過去本應(yīng)該做某事，事實(shí)上沒有做
如：She should have gone to Beijing. 她本應(yīng)該去了北京。（沒有去）
4. be relaxed about sth. 對某事隨意、不嚴(yán)格 如：
They are relaxed about the time. 他們對時間很隨意。
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