Следующее: Поставьте следующие предложения в прошедшее и будущее время, используя подходящий эквивалент модальных глаголов.

1) My friend can do this work himself.

2) You must go there.

3) Mary may take my book today.

1) My friend was able to do this work himself.

2) You had to go there.

3) Mary was allowed to take my book today.

1) My friend will be able to do this work himself.

2) You will have to go there.

3) Mary will be allowed to take my book today.