what引导主语从句后的be动词后加动词原形?

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what引导主语从句后的be动词后加动词原形?
what引导主语从句后的be动词后加动词原形?

what引导主语从句后的be动词后加动词原形?
一般不用原形,如
What I want to do is to help him.
what I want to get is his love.
What I want to know is whether he is safe.

不一定