be about to do:表即将做某事．
e.g The plane is about to take off.
但不能与时间状语连用,不能说
I am about to do my homework tomorrow.
只能和when从句连用
I was about to do my homework when my father came in.
将来时态的一种形式，表示不久的将来将会发生某事，如：
I feel that something terrible is about to happen.
打算做什么..
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