Wang Ya Jie

Hi! My name is Wang Yajie, from China,

* Hi! My name is Wang Yajie from China.

- you do not need commas

I want to know some will teach English friends,

* I want friends that will teach me English.

- you can also say "I want to know people that will teach English."

- I corrected the sentence so that the verb (want) is attached to the noun (friends) then ended it with a purpose (will teach me English)

you teach me English, I teach you Chinese, Mandarin, Henan dialect, as well as the jingle

* If you teach me English, I can teach you Chinese, Mandarin, and Henan dialect, as well as the jingle.

- by adding "if", it indicates that it might happen as opposed to it happening for sure ("you", or the reader, isn't guaranteed that they'll teach you English)

- "I can teach" is like saying an action that may happen ("I am able to teach right now") whereas "I teach" is more of a way to describe yourself ("I teach kids")

Oh! Free of charge without any fee

Oh! And free of charge!

- no need to add "without any fee." I think everyone knows what free means :) but if you want to add it, it'll be "Free of charge; without any fee."

hope this helps!

Wang Ya Jie

Hi! My name is Wang Yajie, I'm from China., I want to meet friends for language exchange. know some will teach English friends, You teach me English, I will teach you Chinese, Mandarin, and the Henan dialect, as well as the jingle Oh! Free of charge. without any fee