Sometimes I can read and know what they want to talk but I dont know how to speak ？how to write？whatcanido
If you want to improve your speaking skill, you can find some friends and talk to them, let them fix your mistake and you will learn from your mistakes.
If you want to improve your pronunciation and your accent, you have to try your best to listen to native speakers via VOA website or watching movies.
If you want to improve your writing skill, you can read as much as possible, try to learn phrases, sentences and grammar from news, essays,...
In general, practice is the main key for everything.
Kelly is absolutely right and there are many of us on here willing to help you, as I am.
Just do it! Everything you need is desire. If you have a desire you'll reach a lots.
Just try and never give up.
If you problem is speaking then you should find someone to talk to in English because that will help you build confidence and be more comfortable in talking. You will get used to talking in that language when you get enough practice. But if you want to write, you have to read a lot! Anything that you like, love novel or whatever and write notebook entries here as much as possible to let other people correct your mistakes and learn from it as much as you can.