they waited for the bus
否定句 They didn't wait for the bus
一般疑问句Did they wait for the bus
肯定回答Yes,they did
否定回答No,they didn't
he has five stickers
否定句 He doesn't have five stickers .
一般疑问句Does he have five stickers .
肯定回答Yes,he does
否定回答No.,he doesn't
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