Написать в и будущем времени.
I read books often
In summer they swim in the river
My friends help their parents
He has four classes every day

ответ:I read books. I will read books often.

In summer they swam in the river. In summer they will swim in the river.

My friend helped their parents. My friends will help their parents.

He had 4 classes every day. He will have 4 classes every day.

Объяснение: Past Simple and Future Simple