Last week our class organized an activity to thank our teach

Last week our class organized an activity to thank our teachers before graduation.On
Thursday we had a class meeting to discuss what to do.We came up with many good ideas.
Then we decided to send them gifts and do some good deeds.
The next day we carried out our plan.Some of us cleaned the teachers’ office and
decorated it with lots of flowers,making it more comfortable for the teachers to work in,
others helped wash the cars or bikes and some others gave well-prepared gifts to the
teachers.They were very pleased and expressed their best wishes to us.
We all felt happy about what we had done for our teachers.

看了那么多遍，还是没错的啊。
http://zhidao.baidu.com/question/196359079.html?an=0&si=3
你可以看一下，这个链接。我怀疑你题出反了。。

语法没有错误，就是不地道，很中式，这个不能叫改错