באיזה מהמשפטים יש טעות בגרמר? והאם תוכלו לתקן את הטעות?

1.what did this word means
2. Has she been seeing her boyfriend since he left tha contruy
3. I would call him and apologize if I were you
4. If Amir had stoped at the stop swing he wouldnt have caused the accident
5. We were talking on the phone when I heard doorbell
6. Dana has never been to Eilat
7. Ice melts when you heat it
8. The flowers will be delivered two hours after you order them
9. Dan shares everything he hears. If he knew how to keep a secret he would have more friends.
10. I was very happy to see my cousin because i havent seen her for a long time