Complete these sentences with say\says or tell\tells 3.Parents often ....their children

Parents often tell their children bedtime stories. Предки нередко говорят своим детям басни на ночь.

We cant use say / says in this sentence ae say is translated сказать.

We cant use tells because s is the suffix of Present Indefinite which we use in the third person singular. Parents is in the third person but not singular. Parents is in plural. (parent + s). Thats why we use tell. Often is one of the keywords of Present Indefinite.

If we have Parent instead of Parents we use tells.

Parent often tells their children bedtime stories.