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1 my friend was talking to Professor ivanov when I saw him2 when the students heard the bell, they were getting and leaving 3 the two men were discussing something when we interrupted them4 the girl was falling and hurting herself while she rode her bicycle 5 we were just leaving the house when the telephone rang6 he was sitting in a cafe when i saw him7 when i went out the sun is shining 8 while she was playing the piano i was writting a letter 9 when the telephone rang we were having dinner10 she was going to the plant when i met her