英语语法With a lot of homework __________(do),he had to stay at

两句中with都是表原因.但第一句主语是he,原句是He had a lot of homework to do,so he had to stay at home.因为他有很多工作要做,所以他不得不待在家里.
第二句主语是homework.原句应是There were a lot of homework to be done,so his mother asked him to stay home.因为有许多工作需要被做,所以他妈妈要求他待在家里.

两句中with都是表原因。但第一句主语是he，原句是He had a lot of homework to do，so he had to stay at home.因为他有很多工作要做，所以他不得不待在家里。
第二句主语是homework。原句应是There were a lot of homework to be done，so his mother asked him to stay...

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作业将要做，是he来做，前后主语一致，用to do
to be done, 作业将要被做，被he做，前后主语不一致，用to be done