Somebody cleaned the room., The room was cleaned., The room has been cleaned., Somebody is using the computer at the moment., The computer is being used at the moment., The computer is used at the moment., I didn't realise that somebody was recording our conversation., I didn't realise our conversation was recorded., I didn't realise our conversation was being recorded., They have postponed the meeting., The meeting has postponed., The meeting has been postponed., When we got to the stadium, we learnt that they had cancelled the game., We learnt that the game had cancelled., We learnt that the game had been cancelled., They are building a new ring-road round the city., A new ring-road is being built round the city., A new ring-road is built round the city., They have built a new hospital near the airport., A new hospital have been built near the airport., A new hospital has been built near the airport., We learned many new words today., Many words were learned today., Many new words have been learned today., Somebody cut the tree in my yard., The tree in my yard has been cut., The tree in my yard was cut., A group of students are writing a song., The song is being written., The song is written.

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