How to keep our English ability well?

1. Listening Western Film (with English speech of course) without subtitle.

2. Find friends from another country. The easiest way

3. be active in some "english" forum.

4. Read Online comic in english language. It will help you improve ur English

5. Another tips is go find some books in English (You can google some and it'll gave you free sample or even a free book) read it in front of your recorder (you can use your phone for that) and save it. after that, play your recording sound, and see if there's any pronunciation's mistake. do it regularly and you'll be surprised in another month how your English doing (it also can improve your vocabulary and pronunciation!)

6. you can find a lot of sites to practice speaking English, like Verbling (verbling.com, it's a paid one, you can have lessons there) or How do you do? (howdoyou.do, this one is free, but does not have lessons) - and I'd recommend using such sites to stay in touch with the language and practice it if you can't find a speaking partner.