You are supposed to shake hands 5

　　1. be supposed to do .　应该　如：

　　We are supposed to stop smoking. 我们应该停止吸烟。

　　知识拓展　表示应该的词有：should, ought to ,be supposed to

　　2. shake hands　握手　　shake 本意是“摇动、震动”

　　3. You should have asked what you were supposed to wear.

　　你本应该问清楚怎么样穿才得体。中的“should have asked”是

　　“情态动词＋现在完成时”表示过去本应该做某事，事实上没有做

　　如：She should have gone to Beijing. 她本应该去了北京。（没有去）

　　4. be relaxed about sth.　对某事随意、不严格　如：

　　They are relaxed about the time. 他们对时间很随意。

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