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否定句：They don't go to school by bus.
一般疑问句：Do they go to school by bus?
肯定回答：Yes,they do
否定回答：No,they don'tKAtaplay tennisafterschool否定句：Kate doesn't play tennis after school 一般疑问句：Does Kate play tennis after school？肯定回答：Yes ，she does否定回答：No，she doesn't