One possible version:
Dear Kate,
I’m writing to you for some questions about learning English.
You know, I have great interest in English all the time. However, I find it difficult to learn.
In China, if you want to learn English well, listening, speaking, reading and writing are quite important. I wonder whether it is the same in Canada.
Besides, our teachers tell us again and again that grammar is very important; we must take it seriously. However, I don’t like grammar. It is so boring that I never learn it well. Dear Kate, is grammar also very important to you native speakers?
I am looking forward to hearing from you soon.
Yours,
Han Mei
略