Упражнение 1. Выберите правильный вариант ответа: 1. Both/All of my sisters are doctors. 2. I like both/all of these books. 3. Both/All of us went to the party. 4. She bought both/all of those dresses. 5. Both/All of my friends support me.

1. Both of my sisters are doctors.
2. I like both of these books.
3. Both of us went to the party.
4. She bought both of those dresses.
5. Both of my friends support me.

Местоимение "both" используется, когда речь идет о двух предметах или людях.