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I need to know why we do not use these helping verbs (do, did and does) in positive sentences. Let me give you some examples to explain it in a much better way.

He works (positive).

He does not work (negative).

Does he work? (question).

How would the meaning be changed if I rewrote the same sentence using does?

He does work.

5

When DO is used in an ordinary declarative (positive) sentence it expresses emphatic assertion, usually in contrast to a prior negative. In speech it receives primary stress.

Jill is too shy to work well on teams, but she does work well on her own.

Speaker A: Jack doesn't work here any more.
Speaker B: He does work here, but he's on the night shift.

In older English the DO forms were employed more freely, alternating with simple present and past. You will find it frequently in Shakespeare:

O she doth teach the torches to burn bright!

Why, man, they did make love to this employment.

But it had largely disappeared from the Standard dialect by the 18th century, and survives today only in dialects.

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