Употребите правильную форму глагола в пассивном залоге. Your parents (invite) to a meeting. Where is your car? – It (mend) at the moment.   The books already (pack). The castle can (see) from a long distance. The guests must (meet) at noon.

Вот как это будет в пассиве, с кратким пояснением по времени и форме:

1. Your parents are invited to a meeting.
   (Present Simple Passive: be + V3; факт-приглашение вообще/по расписанию.)

2. — Where is your car? — It is being mended at the moment.
   (Present Continuous Passive: be + being + V3; действие происходит сейчас.)

3. The books have already been packed.
   (Present Perfect Passive: have/has + been + V3; результат уже получен к настоящему моменту.)

4. The castle can be seen from a long distance.
   (Passive с модальным глаголом: can + be + V3.)

5. The guests must be met at noon.
   (Passive с модальным глаголом: must + be + V3; обязанность/требование по времени.)