人教版九年级全册unit10 You’re supposed to shake hands. SectionA 1a-2d.第1课时课件（该课件内含频文件）（该课件包含单词语句听力）
1.You’re supposed to shake hands.
be supposed to do sth. 表示被要求或劝告做某事，含有必须、 应该或理应做某事之意。常意为“理应；应该做某事”。
否定形式在be动词后加not，表示禁止做某事。
如：We are supposed to be here at six. You aren’t supposed to take the books out of the
Later, I found out French people are supposed to kiss when they see each other.
辨析：find, invent, find out, discover
discover指“发现”某种本来存在，而以前未被发现的事物或未为人所知的东西。 如：I discovered (that) she was a good cook.
