我把你的意思理解为：这篇作文的中心是围绕“How to learn English”对吗?如果是的,请看下面：One day,my old friend asked me how to learn English .i told him learn english is easy.i always practice speaking english every day for two hours and i try to read some magazine about English.now my English grades is better than before.you can do those ways or other better ways.i hope you can study English well!
