Question

childrens was watch cartoon movies. which tense​

Answer 1

Answer:

it is a past tense

HOPE IT HELPS YOU

Answer 2

Answer:

Your English is wrong dude.

First of all, it's children, not childrens

And then was never comes with first form of verb, it always come with ing form

And yeah, was don't come with plural nouns, it comes with singular and here children is plural

If the sentence was: Children were watching cartoon movies.

Then, it's Past Continuous Tense