your homework ( ) by the time i come backA is to being domeB is doneC is to been done D is to be done
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your homework ( ) by the time i come backA is to being domeB is doneC is to been done D is to be done
your homework ( ) by the time i come back
A is to being dome
B is done
C is to been done
D is to be done
your homework ( ) by the time i come backA is to being domeB is doneC is to been done D is to be done
选择D is to be done
先说初中阶段涉及到的六种时代的被动语态:
一般现在时:is done
一般过去时:was done
一般将来时:will be done; am/is/are going to be done; is to be done
现在进行时:am/is/are being done
过去进行时:was/were being done
现在完成时:have/has been done
所以先排除选项A is to being dome 和C is to been done.
再看题目by the time I come back,是表示将来的时间,因为是时间状语从句,所以用一般现在时.
所以主句应该用一般将来时,只能选择D is to be done.
意思是:到我回来的时候,你的作业要做完.
A
当我回来的时候,你正在完成作业
我回来时一个瞬间发生的,所以应该用现在进行时
~~这种题不好解释啊,应该靠语感了~