Помогите с английским.. заранее огромное спасибо!!

... Поставьте следующие существительные в притяжательном падеже.
1. the book of a teacher
2. the boy of our friend
3. a picture of this girl
4. the glasses of my grandmother
5. the studio of the painter

...Раскройте скобки, употребив прилагательные в нужной степени сравнения.
1. Which is (large): the United States or Canada?
2. What is the name of the (big) port in the United States?
3. Moscow is the (large) city in Russia.
4. The London underground is the (old) in the world.
5. He is a very (tall) man.

... Перепишите предложения, подчеркните эквивалент модального глагола.
1. I have to do this work now.
2. He will be allowed to join the sport section next week.
3. She was not able to come to me yesterday.