Hi Daley,
I've corrected your text, and also made some suggestions for your limerick to help it come off the tongue easier.
A Limerick
It's my lunch-hour and I'm listening to Rihanna. I have nothing to do, so I decided to make write a limerick. I'm not sure that it's nice and quite any good or funny, However, I'll give it a try. Hmm...
There once was a young man,
Who liked to would play with a can,
Once he threw it so high,
That the can flew up to reached the sky.
And ever since then,
He's played with a pan.
It's a pity my lunch-time is over. It's a pity....
I'd be happy if you like my limerick :))
Thanks