Well, first let me structure portray -
Five lines in a strict rhyme scheme stay
The first two and last
With third-fourth do contrast
This rhyme scheme’s AABBA!
So each line should always have three
Of it’s syllables stressed, let’s agree.
It’s trimeter form
And quite a strict norm
For the first two and last line you see.
The couplet meanwhile has two
Of it’s syllables stressed, as you knew.
But harder is matching
And moving and patching
The number of unstressed parts too.
When you write a good lim’rick, it’s best
To have syllable “feet” not be messed,
But have unstressed parts match
Like in this one you’ll catch
I have two quiet ‘fore the ones stressed.
While two unstressed each time
Is common, I will chime
Just one works too
The goal’s that you
Can match within each rhyme.
I hope I answered your question!
I’ve got to admit, in confession,
I clearly don’t always
Do all that in all these,
But I hope it’s a helpful suggestion! :)