The base form of the verb is do. The past simple form, did, is the same throughout. The present participle is doing. The past participle is done.

Do is past tense?

The past tense of do is did. The third-person singular simple present indicative form of do is does. The present participle of do is doing. The past participle of do is done.

Do change into past participle?

Past Participles of Regular Verbs

To do so, add ed, d, or t, as in these examples that show the verb on the left and the simple past tense on the right: Jump > jumped. Sleep > slept.