John knows everything about computers,  - doesn't he ?, He started very early, - didn't he ?, He doesn't go out with his friends much, - does he ?, His parents are very proud of him, - aren't they ? , They didn't want to accompany him on his trip,  - did they?, He hasn't been to many parties, - has he ?, He won't go to this one either, - will he ?, His classmates were happy to hear about his success,  - weren't they ?, John would like to be left alone, - wouldn't he ? , He has been to many competitions so far,  - hasn't he ? ,

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