Yana cooks very well.
They play football every weekend
Present Simple сам по себе очень прост. Если используется в сочетании с I, you, we, they - после глагола ничего не ставим. Если в сочетании с he, she, it - после глагола добавляем -s.
Например:
They play basketball very well;
She reads books.
2 mustn't
3 will have to, mustn't
4 will have to
5 must
6 have to
7 have to
8 mustn't
We have been studing English since we were in 7th form.
Нет,в паст симпл не добавляются окончания.