Tell me please which sentence is correct.

Kate, could you make a sandwich while I will think of it?

Kate, could you make a sandwich while I think of it?

What I have definitly heard a native english speaker say was this:

I have not decided yet, so roll the intro while I think of it.

I suspect the speaker was talking about the future because if he was talking about the present, I guess, he would say something like while I am thinking of it. Tell me please if I am wrong.

  • If while is temporal (and doesn't mean "on the other hand") you won't find will + bare infinitive in the while-clause. Intention is not action-in-progress. Jun 14 '18 at 12:05

The answer to your question depends to some extent on what you consider the present and what the future.

Any phrase that begins: while I do something

is likely to refer to the immediate present leading into the future.

While I think of it

indicates that the speaker is starting to think about it and will continue to do so until he/she reaches a decision. That might be a matter or seconds or (considering the length of intros) a minute or two. Most people would regard that as being now, at present rather than in the future.

While I am thinking of it

is just another way of saying the same thing. There is no difference in meaning.

However English speakers use the simple present and present continuous to refer to both present and future activities.

I wonder/am wondering about....

both refer to the present.

I go/am going tomorrow

both refer to the future.

It's the context that indicates when something takes place, not the verb.

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