They had lunch at school.改为否定句 一般疑问句 并作两种回答

问题描述:

They had lunch at school.改为否定句 一般疑问句 并作两种回答

否定句;【They didn't have lunch at school.】
一般疑问句; 【 Did they have lunch at school?】
肯定回答;【Yes,they did.】
否定回答;【No,they didn't.】
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