Be about to

Be about to is an English lexical-grammatical structure.

Future

• it's very commonly used to express future intention - similar to the "be going to" structure I'm going to make a nice cup of tea, but more immediate: I'm about to make a nice cup of tea.

Past

• In the same way that "be going to" is often used in the past, I was about to make a cup of tea is a typical expression referring to an intention that didn't materialise in the recent past (I was about to call you) or has been temporarily interrupted I was about to make myself a cup of tea but now that you're here I'll make a teapot.

Short answers

Like any other auxiliary, when used as a short answer to a question, it's used without the main verb: Have you done your homework? - I was about to.

References

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