1) Somebody has cleaned the room. a) The room was cleaned. b) The room has been cleaned. 2) They have postponed the meeting. a) The meeting has postponed. b) The meeting has been postponed. 3) Somebody is using the computer at the moment. a) The computer is being used at the moment. b) The computer is used at the moment. 4) They shoot most of the scenes in a studio a) Most of the scenes were shot in a studio b) Most of the scenes are shot in a studio. 5) What a pity ! They have just cancelled the game ! a) The game was just cancelled ! b) The game has just been cancelled ! 6) They are building a new ring-road round the city. a) A new ring-road is being built round the city. b) A new ring-road is built round the city. 7) They have built a new hospital near the airport. a) A new hospital have been built near the airport. b) A new hospital has been built near the airport. 8) They must invest big sums of money. a) Big sums of money must be invested. b) Big sums of money have been invested. 9) The Maori tribes originally performed a haka as preparation for battle. a) A haka was originally performed as preparation for battle. b) A haka is originally performed as preparation for battle. 10) I'm sure the detective will solve the case in no time ! a) I'm sure the case was solved in no time ! b) I'm sure the case has been solved in no time ! c) I'm sure the case will be solved in no time !

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