I don't know when l shall start the work.(用动词不定式改写)I don't know when _____ _____ the work.

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I don't know when l shall start the work.(用动词不定式改写)
I don't know when _____ _____ the work.

动词不定式就是to do
do表示动词..
第一个格就用to
而原句的从句只有start是动词...
所以就用to start
I don't know when to start the work.