he is happy only when mary is with him为什么说mary is with him能不能去掉is ,is 之后可加介词?

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he is happy only when mary is with him为什么说mary is with him能不能去掉is ,is 之后可加介词?

he is happy only when mary is with him为什么说mary is with him能不能去掉is ,is 之后可加介词?
he is happy only when mary is with him
为什么说mary is with him能不能去掉is ,is 之后可加介词?

he is happy only when mary is with him为什么说mary is with him能不能去掉is ,is 之后可加介词?
be with sb 和sb在一起
不能去掉is 去掉句子中就没有系动词了,句子就不成立了
例如:I am a pupil.去掉am句子就缺少成分不成立了.

when mary is with him是时间状语从句
既然是句子,就要有完整的句子结构
mary是主语,is是系动词,with him是介词短语做表语

不能,is后面加介词好像是表状态