Oh, they just grow, which is part of the folk process.

Don't haul on the rope
Don't climb up the mast
Any if you see a sailing ship
It might be your last
Get your civvies ready
For another run ashore
And a sailor ain't a sailor ain't a sailor any more.

I bet you can all work those out....


And then of course the final chorus

Don't haul on the rope
Don't climb up the stick
You can't sing proper shanties
If you haven't got a dick
So if you'd be a shantyman
A-rising through the ranks
Take a pair of rolled up socks
And stuff them down your pants.

You might be able to work those out too....