1.does 主语是he 第三人称单数
2.waiting be +doing 这是进行时态的形式
像 Mike often __for the bus 这里就得用 waits
3.is air 和 water 的谓语一般都用单数形式
用所给词的正确形式填空,并说明为什麽这样填：He usually__his homework after dinner.
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