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“’s”常用来表示名词所有格,例如Jim’s bike,Li Ming’s backpack,但“’s”并非都是名词所有格。现简述如下:1.is与某些词的缩写形式。例如:What’s this in English?He’s a good friend of mine.2.has与某些词的缩写形式。例如:She’s seen the film before.He’s already finished his homework.3.us与let的缩写形式。例如:Let’s have a rest.Let’s go to the park by bike,shall we?