为什么句子这里需要使用being句子是:The improvement in his health is being maintained.不是已经有系动词了么,直接用被动语态不就好了吗?The improvement in his health整个做主语.为什么要在这里使用being.

问题描述:

为什么句子这里需要使用being
句子是:The improvement in his health is being maintained.
不是已经有系动词了么,直接用被动语态不就好了吗?The improvement in his health整个做主语.为什么要在这里使用being.

这是现在进行时的被动语态形式是 be(is,am are)+being+done