Ответ:

Расшифруем слова и поставим глаголы в форму Present Continuous: am/is/are + глагол с окончанием -ing.

  1. swim → swimming — He is swimming.
  2. skate → skating — I am skating.
  3. cut → cutting — She is cutting the tomatoes.
  4. sit → sitting — The boy is sitting at the desk.
  5. dance → dancing — The girls are dancing.
  6. write → writing — Mum is writing a letter.
  7. drive → driving — Grandpa is driving the car.

Ответ: 3 — is cutting; 4 — is sitting; 5 — are dancing; 6 — is writing; 7 — is driving.