Eccentricity что означает это слово ? как его понять(мне не нужен просто перевод на язык) , заранее

1. I played tennis yesterday but I have not won. 2. We were waiting a long time for the bus but it has not come. 3. She has seen me but she hasn't spoken to me. 4. Did it rain yesterday? -No, it wa a nice day. 5. That's a nice bag. Where have you bought it? 6. That was а good thing to do. Why did you not do it? 7. I did not see him in the laboratoгу yesterday. 8. He arrived at 6 р. m. yesterday. 9. They were friends two years ago. 10. We had 30 lectures last week. 11. Hе liked the film he watched last Monday. 12. I lost my key yeasterday. 13. It was cold, so I took on my coat. 14. I wasn't very tired, so I didn't go to bed early. 15. It was a funny situation but nobody laughed. 16. The hotel wasn't very expensive. It didn't cost very much. 17. She wasn't hungry, so she ate nothing. 18. What did you do at the weekend?

36) Where does your friend live? (Present Simple, т.к. вопрос про постоянное действие)

37) Tomorrow the children will write a test. (Future Simple - есть слово tomorrow=завтра)

38) Mike hasn't spoken to Mary since Christmas. (Present Perfect, слово-маркер - since, действие не совершалось с какого-то момента в до настоящего времени)

39) I was very busy last week and didn't help my mother about the house. (Past Simple - маркер - last week)

40) Pete can't find his pen. Somebody has taken it. (Present Perfect: выражает действие в недавнем , когда точно произошло действие мы не знаем, да и это неважно, а важен результат в настоящем: ручки нет)