22. Choose the correct tense forms. While she ... for her test, her brother ... football with his friends.

Решение:

Предложение описывает два параллельных действия, происходивших в прошлом. Для описания одновременных длительных действий в прошлом используется Past Continuous для обоих действий.

1. 'studies, had played' - Present Simple, Past Perfect.
2. 'was studying, was playing' - Past Continuous, Past Continuous. Правильный вариант.
3. 'was studying, has played' - Past Continuous, Present Perfect.
4. 'studied, is playing' - Past Simple, Present Continuous.
5. 'has studied, was playing' - Present Perfect, Past Continuous.

Ответ: was studying, was playing