I can only suggest that you read well written English books. Here's a tip.  It is usually a mistake for a beginner to merge words.  Try using "I want to" rather that "I wanna".  Also, try not to say "more easier".  Instead you could say either "easier", or "more easily".  Both are good grammar. 

Incidentaly, another very common mistake is to use "good" instead of "well.  One can only feel good, and speak well.  Admittedly many people, when asked how they are, say "I'm good", but it is not good grammar.  You might answer, "Very well thank you, and you?"

A good book to read in English is "Alice in Wonderland".  It's good fun, and the grammar in it is almost perfect.

Good luck in your efforts.