the article sugguests that when a person is under unusual stress he should be especially careful to have a well-balanced diet中为什么用is不用动词be

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thearticlesuggueststhatwhenapersonisunderunusualstressheshouldbeespeciallycarefultohaveawell-balance

the article sugguests that when a person is under unusual stress he should be especially careful to have a well-balanced diet中为什么用is不用动词be
the article sugguests that when a person is under unusual stress he should be especially careful to have a well-balanced diet中为什么用is不用动词be

the article sugguests that when a person is under unusual stress he should be especially careful to have a well-balanced diet中为什么用is不用动词be
when的后面是个从句,从句就是另外一个独立完整的句子,表修饰.所以用is而不用be.