My friends go/goes swimming in summer.

My friends go swimming in summer. — Мои друзья купаются летом.

My friends do not go swimming in summer

Do my friends go swimming in summer?

Who goes swimming in summer?

Where do my friends go in summer?

When do my friends go swimming?

Do my friends or does his friend go swimming in summer?

Do my friends go swimming or running in summer?

Do my friends go swimming in summer in autumn?

My friends go swimming in summer, do not they?

My friends went swimming in summer. (Past Simple).

My friends will go swimming in summer. (Future Simple).