Memorize model sentences of each grammar point that you want to learn. Then when it comes time to use each point of grammar, just change the words in your memorized sentences.

to learn grammar, 1. try to learn the basic by one speaking your language. 2. choose some simple grammar books such as Grammar in Use and Focus on Grammar. 3. make use of some freat website.... and i recommend you http://www.oup.com/elt/global/products/headway/ http://www.oup.com/elt/global/products/englishfile/ ou can learn, practise and check.

till today, i really don't know much about grammar. haha. that is not the only way to impove your ability.

check on English language learning sites.. Try BBC's English language courses or Learningenglish. There are many of the online !