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5. that’s 是that is的缩写形式。当人称代词、指示代词及疑问词与be动词(am, is, are)等连用时，为了简便常用缩写。 缩写形式： who is = ________ who are = _______ they are = _______ I am = _________ she is = ________ he is = _________ it is = ________ what is = ________
who’s
who’re
they’re
I’m
she’s
he’s
it’s
what’s