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现在大家都会在网络上汲取相关知识内容，比如be to do的三种常见用法_be to do，为了更好的解答大家的问题，小编也是翻阅整理了相应内容，下面就一起来看一下吧！

1、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.。

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