This funny song about how to write limericks... is partly a limerick itself !
Nick, from the 'Imagine Learning English' software indicates you the steps to write a great limerick :
Writing a limerick : 9 steps
#1 Know the basic characteristics of a limerick :
A limerick contains five lines. In this mini-poem, the first, second, and fifth lines rhyme, and the third and fourth lines rhyme.
#2 Choose the ending of your first line, usually a geographical place.
#3 Think of lots of different things to rhyme with your first line ending.
#4 Make associations with the rhyme words.
#5 Pick a story that appeals to you, and decide on who the person(s) is you introduce in line.
#6 Make the first line nice and fitting with the meter.
#7 Choose a situation or action in which your person starts off.
#8 Think of a 'turn' or 'twist' in your story, while considering rhyme words for the 3rd and 4th line, but save the punchline for your last line.
#9 Go back to your list of rhyme words and find a nice one to wrap up the story with a punchline.
Where does the word 'Limerick' come from ?
It derives from Limerick, an Irish town. Apparently a pub song, or tavern chorus based on the refrain "Will you come up to Limerick ?" where such bawdy songs or 'limericks' were sung...
The passive voice is commonly used in the English language, much more often than in French. Try and remember the drawings -these do help !- and memorise the structure. 
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