English grammar rule Did past
Do, does, or did can sometimes be used as helping verbs. Sometimes, they add emphasis, form a question, or combine with not to express a negative. In these situations, use the root form of the main verb.
Incorrect Polly do not keeps her receipts Correct Polly does not keep her receipts. Incorrect Tim did not attended the show. Correct Tim did not attend the show.
Incorrect Does Dorothy enjoys ice cream? Correct Does Dorothy enjoy ice cream? Incorrect Did you pushed the cart? Correct Did you push the cart?
Incorrect I do thinks you are avoiding me. Correct I do think you are avoiding me. Incorrect The snake did coiled around the mouse! Correct The snake did coil around the mouse!
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