Сделайте вопросительным:
The boys play football.
My friend plays basketball.
My sister likes to swim in the river.
The pupils run well.
They swim well.
Denis jumps well.
(с помощью do,does,3 класс)

Ответ:

Do the boys play football?

Does my friend play_ basketball?

Does my sister like_ to swim in the river?

Do the pupils run well?

Do they swim well?

Does Denis jump_ well?

С подлежащим Он, она, оно - берём Does

В остальных случаях (я, ты, вы, мы, они) берём Do