1. Had you traveled by plane by the time you were 6? Yes, you had./No, you hadn't. 2. Had he made many friends by the time he was 10? Yes, he had./No, he hadn't. 3. Had she tried to roller-skate by the time she was 3? Yes, she had./No, she hadn't. 4. Had it swum in the sea by the time it was 4? Yes, it had./No, it hadn't. 5. Had we started school by the time we were 7? Yes, we had./No, we hadn't. 6. Had you read many books by the time you were 8? Yes, you had./No, you hadn't. 7. Had they begun to learn English by the time they were 5? Yes, they had./No, they hadn't.