How to write a limerick:
The first, second and fifth lines rhyme with each other and have the same number of syllables (typically 8 or 9).
The third and fourth lines rhyme with each other and have the same number of syllables (typically 5 or 6)
Limericks often start with the line "There once was a..." or "There was a..."
There once was a lady called ‘Mom’,
who you could say was quite the bomb.
She gave us all hugs,
and swept up the rugs.
She kept the house nice and calm.
There once was a woman named Nanny
whose height was quite uncanny.
Small as she was,
she made quite a buzz,
and often fell flat on her fanny.