I am leaving in a minute.I will finish all my work before I_

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I am leaving in a minute.I will finish all my work before I_____(leave).
before是不是介词?后面是加 v.ing
为什么有“I”和没“I”答案不一样？

有I的话后面相当于是个完整的句子,考虑到时态,当然用动词原形了.若没有I,就是介词+动名词结构了.如果这里的I改为my作定语,那么就应该填leaving了,但是如果这样的话最好还是填名词形式left.
有问题可以私聊.
leave
若没有I,那么填leaving,但是有I,所以填动词原形leave.因此介词后面若直接加动词,需将动词改为动名词形式.
有疑问还可私聊.

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