Teacher: Tracy, what's the plural of mouse?
Teacher: Excellent. Now, what's the plural of baby?
Teacher: Nicky, spell mouse.
Teacher: Not bad. But what's on the end?
Nicky: A tail?
Teacher: T T
Teacher: If can't is short for cannot, what is "don't" short for?
Teacher: Martina, can you give me a sentence beginning with "I"?
Martina: I is the...
Teacher: No, no, no! You must always say, "I am..."
Martina: I am the ninth letter of the alphabet.