Use of the wrong tense

Using the past tense after did instead of the infinitive without to.

(a) To ask questions:

Don’t say: Did you went to school yesterday?

ü Say: Did you go to school yesterday?

(b) To make negatives:

Don’t say: I did not went to school yesterday.

ü Say: I did not go to school yesterday.

Use the present infinitive without to, not the past tense after the auxiliary did.

Note: the answer to a question beginning with did is always in the past tense: Did you see the picture? – Yes, I saw the picture; or Yes, I did.