if you want to take it up a notch, try teaching them text message english. i did a lesson on a while back. very popular.
it's 2 l8 2day 4 me 2 learn english.
develop a lesson around how to decipher text message english.
-broken grammar rules
-read numbers and letters phonetically to complete words
-acronyms e.g. lol
-symbol usage e.g. *$ = starbucks