do anyone know any websites to teach me grammars?..like practice questions or vocabulary test???
This is one of the best sites I've found. I use it with my grandchildren, and they learn lots, even when they're taking the quizzes in Grammar Blast:
http://english-zone.com/index.php?ID=1
You can use all the features with little sunglasses next to them without joining.
http://grammar.ccc.commnet.edu/grammar/
At the bottom of just about every topic in the Word & Sentence Level section, there is at least one quiz. The explanations here are excellent, and lead right up to their quizzes.
=)