is about to do 是一般将来时的一种表达方式,表示的是“即将/就要干某事”；was about to do是过去将来时的一种表达方式,同样也是表达“即将/就要干某”.比如：I am about to leave.I have no time to do anything.
is about to do was about to do分别属于什么时态啊
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