1 Year

I living here 1 year, used living here, used left driving, because in china we are driving keep the right. in here i can speaking, but sometimes i think sometimes my grammar is wrong, i hard studying english everyday. i think if i can speaking like mandarin i can do anything in here.

One Year

I have been living here in the United States for one year.  I am now used to living here and driving on the left side of the road (in China we drive on the right side of the road).  Living in the US I can speak English, but sometimes I think my grammar is incorrect.  I am studying English diligently everyday.  I think that if I can speak English like I can speak Mandarin that I can do anything in the US. 

It does seem like you have a good vocabulary and are comfortable expressing yourself in English.  However, you are right that your grammar still needs some work.  Keep studying and you will only get better and better!