英语简单的短文改错~急~

There was a time when Zhang Yi and I were good friends,but now we are like strangers.On his first day in our class two years ago, he had no one to talk to. I was the first one to say hello to him, so we became friends. Zhang Yi did well in math and he was always ready to help me with it. One day last month,I told him that I would be away from school for two days to see a friend. But he told my father about it and made me angry. Now, I konw I was wrong. I decide to say sorry to him, because I don't want to lose such a good friend.

stranger加ing talk改talking don't改doesn't