Tongue-twisters

Which means:

noun a sequence of words, typically of an alliterative kind, that are difficult to pronounce quickly and correctly.

She sells sea shells by the seashore.
The shells she sells are surely seashells.
So if she sells shells on the seashore,
I'm sure she sells seashore shells.

Peter Piper picked a peck of pickled peppers.
How many pecks of pickled peppers did Peter Piper pick?
If Peter Piper picked a peck of pickled peppers,
Where's the peck of pickled peppers Peter Piper picked?

 How much wood would a woodchuck chuck if a woodchuck could chuck wood?

A woodchuck would chuck no wood since a woodchuck can't chuck wood.

But if a woodchuck could chuck wood and if a woodchuck would chuck wood, how much wood would a woodchuck chuck?

If a woodchuck could chuck wood and if a woodchuck would chuck wood, should a woodchuck chuck wood?

A woodchuck should chuck wood as long as a woodchuck could chuck wood and as long as a woodchuck would chuck wood.

A woodchuck would chuck as much wood as it could chuck if a woodchuck could chuck wood.