Nina ___________English for 2 years., has been learning, has learned, The birds_____________ to the South., have already flown, have been flying, Mike ___________ to learn the poem., has forgotten, has been forgetting, The children______________cartoons for 2 hours., have been watching, have watched, The train_______________ ., has just come, has just been coming, She________________at this school for twenty years., has been teaching, has taught, David _____________his studio since 10 o’clock., has been painting, has painted, How long _______TV?, have the children been watching, have the children watched, How many books ____________?, have this writer written, have this writer been writing, How long _____________for me?, have you been waiting, have you waited

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