Duplicate:
“did shoot” vs “shot”
When do you use “Did + 1st form” instead of “2nd form”?
Use of “do” in affirmative statements
I know that did is used when asking or when using a negative sentence.
— Did you play soccer?
—I didn't play soccer.
But I'm wondering whether it can be used also when we are talking about affirmative sentences.
For example, "I did play soccer" instead of "I played soccer".
It's grammatically correct?