necessary 后置的用法

Then, and only then, are his services necessary. necessary 可以后置吗，是表when neccessary的意思？还是省略了that is

这是由于only then即only+状语前前置而导致的部分倒装句。并不是necessary后置修饰。

His services are necessary only then.

Only then are his services necessary.

I saw him only yesterday.

Only yesterday did I see him.

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 1秒前

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