Learn English Free

Learn English Free is the best app to Learn English quickly.
Many grammar lession about tenses, basic: can, could, may/might, question tags, should have, used to ...

Many grammar test about Active or Passive Voice, Adjectives, Adverbs, Articles, Auxiliary Verbs, Conditionals, Conjunctions, Determiners, Idioms, Interjections ...

It's free and can be used offline.
You can also practice with your friends, and share the contents of this application to social media such as Facebook, Line, Whatsapp, BBM, Twitter, WeChat, Hangouts, Google+, GTalk, etc.
Available apps from basic to advanced level, check this out ;)
So using this Learn English Free app to improve your English speaking, writing, reading, and listening skills and knowledge about basic English.

I hope this app is useful for you. Thank you :)