Look!Somebody has broken a glass.

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/09/27 08:21:53

Look!Somebody has broken a glass.
Well,it__ me.I__ that.
A.wasn't;didn' do
B.isn't;haven' done
C.wasn't;hadn't done
D.isn't;didn't do
为什么前面一个空格用现在时呢?
后面的为什么用助动词呢?

第一个空说明这件事我没做过,刚才没做,现在也没做,所以用isn't.
第二个空是说打碎玻璃这件事不是我做的,事情已经发生了,表示过去某个时间发生的动作.
为什么不用现在完成时是因为：现在完成时是表示过去发生的动作对现在造成的结果或影响常和already,yet,just,ever,never,before,连用,也没有要持续的意思.所以不用现在完成时.
用了助动词,你记住一点：没有be,就要加助动词,就可以了.

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