题目内容：

短文改错

Yesterday I buy a new coat in a shop，and I found it was too big for me．This morning，I went to the shop and change the coat I bought yesterday．But the salesgirl treated me cold．Firstly，she didn't admit  that I buy the coat in her shop．Then，she said I made it be dirty．So I got very angry and quarreled with  him，pointing to the rules on the wall．Just then，manager turned up．He said sorry to me．At last they changed other one for me．Then I said good-bye to them and took the new coat home happy．