But I don't know when he---------(go to bed)

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ButIdon''tknowwhenhe---------(gotobed)ButIdon''tknowwhenhe---------(gotobed)ButIdon''tknowwhenhe-------

But I don't know when he---------(go to bed)
But I don't know when he---------(go to bed)

But I don't know when he---------(go to bed)
goes to bed.我不知道他什么时候睡觉.