Bill is in the classroom.doing 什么homework请说明理由

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• Bill is in the classroom.doing 什么homework
• Bill is in the classroom.doing 什么homework请说明理由
• 有be动词的英语句型变过去式是变be动词还是变be动词后面的动词（变为过去式）?请说明理由例如：I am doing my homewok.(原句）变过去式是I were doing my homework 还是I am did my homework什么时候变be动词,什么时候变动词?
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