be good for的用法
问题描述：
be good for的用法
Morning exercises _____(be） good for us.
Doing Morning exercises _____(are) good for us.
答
Morning exercises _are____(be） good for us.
主语Morning exercises 是复数形式,谓语用复数are
Doing Morning exercises ___is__(are) good for us.
主语Doing Morning exercises 是是动名词短语,谓语一般用单数
be good for 对.有好处
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