He didn't go to bed until he finished his homework.从句中的he可以省略吗?为什么?什么时候从句中的主语可以省略?

He didn't go to bed until he ______(finish) his homework .适当形式填空 he didn't go to bed until very late last night=he__ __late last night he didn't go to bed until his mother came back (改为同意句） He___until he finished his homework?A.didn't go to bed B.went to bed C.won't go to bed Dgoes to bed 选哪一个?请给出正确答案,说明原因.拜托了! He didn't go to bed until he finished his homework为什么finish 要是过去时的啊?不是 didn't 后面跟原型吗? He didn’t go to bed until twelve o‘clock last night这句话中的didn't go为什么用didn't而不用肯定的词语,句子中didn't是否定的吗not.until是直到. He didn’t go to bed until twelve o‘clock last night这句话中的didn't go为什么用didn't而不用肯定的词语,句子中didn't是否定的吗not.until是直到. He didn't go to bed before ten o'clock.(改为同义句) He didn't go to bed ___ten o'clock.是填until呢还是填by He wanted to go to Beijing,didn't he? He didn't go to bed until he finished his homework.从句中的he可以省略吗?为什么?什么时候从句中的主语可以省略? He didn't go to bed until very late last night.(同义句转换)=He ____ ____ late last night. He shouldn't go to bed late.(同义句） But I don't know when he---------(go to bed) 改错1.He didn't go to the cinema yesterday.and I didn't go,too. he didn't go to school because he wan ill 同义句he didn't go to school____ _____his_____. I didn't go to bed until he came back.这句话是 直到他回家我才睡觉 那请问如果去掉didn't 把 go换成went 是不是跟这句话表达的意思一样? I didn’t go to bed until my mother（ ）home.Agot Barrived inCreachDgot to He didn't go to school because of ______(sick).