1) Somebody cleaned the room. a) The room was cleaned. b) The room is cleaned. 2) They postponed the meeting. a) The meeting was postponed.  b) The meeting has been postponed. 3) Somebody uses the computer. a) The computer is used. b) The computer is being used at the moment. 4) They built a new ring road around the city. a) A new ring road was built round the city. b) A new ring-road is built round the city. 5) We learned many new words today. a) Many words were learned today. b) Many new words was learned today.

Active ---> Passive

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