At first it might seem challenging but the more you do them, the easier they get.
So let’s listen to it and practice sound /S/ & /SH/:
She sells seashells on the seashore.
The shells she sells are seashells, I’m sure.
So if she sells seashells on the seashore,
Then, I’m sure she sells seashore shells.
This tongue twister with S and SH sounds is based on a real song about a seashell seller named Mary. She was not an ordinary seller. She collected fossils, studied and sold them to tourists and scientists.