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1) Mrs Johnson has become a writer. 2) Bob and Charles have been to the States many times. 3) Have you swum in the Pacific? 4) We have not done our lessons. 5) I have not decorated the hall. 6) The girls have jumped high. Their results are very good. But they have run 5 kilometres badly. 7) Betty has begun learning English. 8) Has Polly rung up Doctor Gordon? 9) Has Boris come back? — No, he hasn’t. He never comes back earlier than six. 10) Jane says she has not seen any of the Harry Potter films before.