You have to practice directly by checking the grammatical rules and trying to apply them in exercises on a regular basis.
Indirectly by reading and speaking you will automatically get hold of the sentence strucutre and many of the other applicable rules.
Don't worry,that is a common problem for Chinese learning English, because of the reversed built sentence strucutre and the different grammar in both languages as a whole.
You can check some grammar and language exercises in general here:
www.learn-english-online.org/
www.1-language.com/
www.1-language.com/audiocourse/index.htm
www.learnenglish.de/
www.ego4u.com/
LatitudeU.com/
www.Englishtown.com/
www.usingenglish.com/testing.html
www.usingenglish.com/quizzes/
eleaston.com/quizzes.html