问题描述：
动词不定式和动名词做表语区分
his wish is to be a astronaut.(为什么用动词不定式?用is being不可以吗?)
his hobby is play basketball.（为什么要用动名词?用to play ）
his wish is to be a astronaut.(为什么用动词不定式?用is being不可以吗?)
his hobby is play basketball.（为什么要用动名词?用to play ）
问题解答：
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