----- Nội dung dịch tự động từ ảnh ----- Exercise 4: Correct the mistake in the following sentences. 1. When I walk past the park, I saw some children play football. A B C D 2. After John eaten dinner, he wrote several letters and went to bed. A B с D 3. What did you do at 9 o'clock last night? I was phoning you but nobody A B C answered. D 4. When I arrived at the station, the train has already left. A B C D 5. Ann and Susan have known each other during they were at school. A B C D 6. She has disappeared three days ago, and they are still looking for her now. A B C D 7. After Mrs. Wang had returned to her house from work, she was cooking A B с D dinner. 8. It's the first time I saw this film. A BCD 9. After he graduates from university, he joined the army. A B с D 10. Up to now, there had been no woman being chosen the US president. A B C D