Memory hook Resembles of the shape of the eye (sideways) with the retina in the middle.

Practice

Chinese	literally	English
目好吗？	eye good (question)	Is the eye good?
目好不好？	eye good not good	Is (your) eye ok (or not)?
目不好吗？	eye bad (question)	Is the eye bad?

[1] My eye! My beautiful eye. by feastoffools from http://www.flickr.com/photos/feastoffools/21121528/, detail, rotated, under license: Attribution-Noncommercial-Share Alike 2.0 Generic