Найдите и исправьте ошибки his son should to help you. they cannot do this exercise yesterday. you ought have told us about his arrival. must i take your dictionary for a while? my children are able swim very well.

His son should help you.
They couldn't do this exercise yesterday.
You ought to tell us about his arrival.
May I take your dictionary for a while?
My children can swim very well.

1) His son should help you
2) Thay coudn`t do this exercise yesterday.
3) You ought to told us about his arrival.
4) May I take your dictionary for a while?
5) My children can swim very well.
P.S. не уверен, но кажется так.