For those who have very little knowledge on English but try to learn English very quickly, I would say to you:
First of all be confident. Learn the basics of tenses from some friends. Know some common words in English from dictionary. Read 'Daily Telegraph' as it consists the words in simplest language among all newspapers. You can read the magazine 'Wisdom' as well. Talk English wherever you can, may be they are wrong but still speak. If someone corrects you dont be ashamed, just give him a thanks because now you have learnt for free. Just practise like it and you always dont need to have correct grammar. Some common English like Got to do it, Some salt please, Nice shirt dude, etc. works even better than 'Correct English'. So just have self-confidence and give it a try. Good Luck!