I don’t know when we shall start the work.

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I don’t know when we shall start the work.
I don’t know when we shall start the work.

I don’t know when we shall start the work.
I don’t know when to start the work.

I don't know when to start the work.

Shall we start the work?

when shall we start the work? I don’t know.

I don't know when. 主谓宾都有了