Rewrite sentences in the passive with full verb forms. Pay attention to the use of modal verbs in passive structures. (Перепиши предложения в пассивном залоге. Обрати внимание на употребление модальных глаголов в пассивных конструкциях.) Образец:
Children may take their toys to the class.
Children’s toys
to the class.

1. You cannot study a foreign language in a couple of months.
A foreign language
in a couple of months.

2. Parents must keep medicine in a safe place.
Medicine
by parents in a safe place.

3. George’s neighbours might have been scratched his car last night.
George’s car
by his neighbours last night.

4. We have to fix the roof as soon as possible.
The roof

1. A foreign language cannot be studied in a couple of months.

Explanation: The active sentence states that "you" cannot study a foreign language in a couple of months. To change it to passive, we need to move the object "a foreign language" to the beginning of the sentence and use the modal verb "cannot" to indicate that it is not possible. The main verb "study" should be changed to its passive form "be studied."

2. Medicine must be kept in a safe place by parents.

Explanation: The active sentence states that parents must keep medicine in a safe place. To change it to passive, we need to move the object "medicine" to the beginning of the sentence and use the modal verb "must" to indicate that it is obligatory. The main verb "keep" should be changed to its passive form "be kept."

3. George's car might have been scratched by his neighbors last night.

Explanation: The active sentence states that George's neighbors might have scratched his car last night. To change it to passive, we need to move the object "George's car" to the beginning of the sentence and use the modal verb "might have been" to express possibility in the past. The main verb "scratched" should be changed to its passive form "been scratched."

4. The roof has to be fixed as soon as possible.

Explanation: The active sentence states that "we" have to fix the roof as soon as possible. To change it to passive, we need to move the object "the roof" to the beginning of the sentence and use the modal verb "has to" to indicate necessity. The main verb "fix" should be changed to its passive form "be fixed."