... had gone away.(P1) It was thought that Mary had gone away.(P2) Mary was thought to have gone away.IV. Các đại từ bất định: No one, Nobody, Nothing,……… Ex: - (A) No one can answer this ... Nothing,……… Ex: - (A) No one can answer this question. (P) This question can’t be answered . - (A) They haven’t done anything. (P) Nothing has been done.EXERCISES Change these sentences into ... Kim______________ (write) this composition last week. That one_____________ (write) by Phi.4. I don’t have my bicycle today. It’s with the repairman. It______________(repair) right now.5. Someone has bought...