Use it as much as you can, find your mistakes and correct it. This is the only way to improve...

look at this one followed http://www.italki.com/Answers/question/41512.htm How to is not a question form...

Hi Yang , I think that it is very important that you listen to and practise spoken English as often as possible. The following sites seem to be the most recommended by Italki members. Or you can click onto Language Partners and Language Teachers at the top of this page for help. These sites are good for listening and pronunciation practice. http://www.bbc.co.uk/radio4/
 http://www.elllo.org/ http://www.bbc.co.uk/worldservice/learningenglish/ http://news.bbc.co.uk/ http://www.usingenglish.com/
 http://www.englishpage.com/
 http://www.tolearnenglish.com/
 http://www.oup.com/elt/global/products/headway/
 http://www.flo-joe.co.uk/
 http://wordweb.info/free/