They need to study hard at school.(做两句否定句,两句一般疑问句）

They need to study hard at school.(做两句否定句,两句一般疑问句）
（一个是need动词用法,一个need的情态动词用法）

英语人气：881 ℃时间：2019-08-21 15:14:16

优质解答

They don't need to study hard at school.
They needn't study hard at school.
Do they need to study hard at school?
Need they study hard at school?

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