4. Mary: You usually... (go) to work by car, don't you? Peter: Yes, but the car... (belong) to my mother and she sometimes... (use) it today to take Tom to the dentist.

Решение:

Первая часть 'You usually... (go)' описывает привычку, поэтому Present Simple. Вторая часть 'the car... (belong)' описывает постоянное свойство, поэтому Present Simple. Третья часть 'she sometimes... (use) it today' описывает действие, которое происходит сейчас, несмотря на 'sometimes', поэтому Present Continuous.

1. Mary: You usually go to work by car, don't you? Peter: Yes, but the car belongs to my mother and she sometimes is using it today to take Tom to the dentist.

Ответ: go ... belongs ... is using