I brought a bunch of teaching workbooks from Canada with me, and I am so glad that I did. Every so often, I find little gems. Considering that many Korean kids seem to have issues with spelling (which is normal for most ESL students, since English has a low sound/spelling correspondence ~ that is, our sounds don't always match our letters), this is something that you may even be able to use in higher levels too.
Basically, there are certain common word endings in English:
-ack
-ain
-ake
-all
-ame
-an
-at
-ay
-ell
-ice
-ick
-ight
-ill
-in
-ine
-ink
-ip
-ock
-oke
-op
-ore
-ug
-ump
-unk
If you mix and match consonants to the beginning of these word endings, you can make new words. Not wanting to use all the endings, I started small with just a few more common endings (like -ight).
Using Wheel of Fortune as an inspiration, I used the most common starting consonant sounds: r, s, t, l, n, m, p, f -- note that I didn't include consonant blends like th or sh.
The worksheet is pretty straightforward (and very ugly, don't say I didn't warn you).
Print off, cut out and laminate the word endings and initial consonants, then let the kids play with combining them to make words. Translating the word into Korean ~ dictionary or Naver ~ is how they verify that it's a real English word and not a random combination (i.e. fake, make, sake, lake, rake are all English words, nake and pake are not).
I will be testing this with my island school tomorrow (only 4 kids) and with my 5th graders next week. These will probably be added to my permanent roster of flashcards, as I plan to add in a few more endings and a few more consonants.