Of course there aren't any definite rules, and I'm certainly no expert, but here are a couple of general observations:

1. Sing about specific events in the verses, and about generalities in the chorus. Example: Verse - The cafe was closing, on a warm summer night / Cathy was cleaning the spoons. Chorus - Tell me why does an old broken bottle / look just like a diamond ring.

2. Put some kind of a hook or pun in the final line of the chorus. Examples: "He's got a way with women and he just got away with mine", "Just call me Cleopatra I'm the Queen of denial".