1) They have written three letters a) Three letters have been written by them b) Three letters have written by them 2) She has cleaned the kitchen. a) The kitchen has been cleaned by her b) The kitchen is cleaned by her 3) The manager has approved the request a) The request has been approved by the manager b) he request was approved by the manager 4) They had completed the work before noon a) The work had been completed by them before noon b) The work was completed by them before noon 5) He had locked all the doors a) All the doors had been locked by him b) All the doors have been locked by him 6) We had forgotten the keys at home a) The keys had been forgotten at home by us b) The keys were forgotten by us at home 7) They were repairing the road all morning a) The road was being repaired by them all morning. b) The road was repaired by them all morning 8) She was typing the report when I entered a) The road was being repaired by them all morning. b) The report was typed by her when I entered 9) The workers were installing the new windows a) The new windows were being installed by the workers b) The new windows were installed by the workers 10) He has delivered all the packages today a) All the packages have been delivered by him today b) All the packages were delivered by him today

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