这是祈使句，动词原型start为谓语动词。因为祈使句没主语，所以only then坐落于句首也没有倒装问题。
He never did it.
Never did he do it. 陈述句
但，Never do it. 祈使句
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这是祈使句，动词原型start为谓语动词。因为祈使句没主语，所以only then坐落于句首也没有倒装问题。
He never did it.
Never did he do it. 陈述句
但，Never do it. 祈使句
相关文章推荐
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