给你朋友写一封信，告诉他怎样学好英语。

Somebody thinks learning English is very hard.Well,firstly,I think you should work hard at it.You should try to have a large vocabulary.If your vocabulary isn't large enough,you can hardly express yourself.Secondly,you should learn some grammar.A good command of grammer can guild you write in a correct way.Thirdly,try to ask others to help you.Well,when you write something in English,show it to your teachers or classmates.They might be able to help you to improve it.Last but not at least,don't be shy.You must overcome your shyness.
If you do these what I have told you,I believe you will improve your English quickly.

给受困朋友写信的英语作文

Dear XXX :
    I , m glad to get your letter !
    I hear you,re often ill . How are you this days ?
    Now I ,ll tell you some ideas . If you do that ,you, ll feel much healthier .
    When you get up in the morning , you can take more exercise and play sports like running . For breakfast , you can have more fruit and drink more milk . For lunch , you need to eat healthy food , such as beef , fish , vegetables and so on . After lunch , you can go swimming . For supper , you must eat some vegetables , some fish and so on . Before you go to bed , you can drink more water .
    Do you sleep well every night ? You must get enough sleep and stay happy every day . 
    wish you a speedy recovery !

    Yours 
        xxxx