Помогите пожалуйста очень прошу 16 задание

Ответ:

1. The story must be told before it's too late.

2. The cat has to be fed 3 times a day.

3. The plants should be watered twice a week.

4. The gallery can be visited at Wednesdays and Fridays.

5. The address ought to be found out by now.

6. The telegram must be sent immediately.

Объяснение:

Модальные глаголы.