3. Irregular plurals

• Show one knife and two knives. Ask: what is it/are they?
• How many knives do you have in the kitchen?
• How many teeth do you have?
• Did you lose any tooth? How many? How old were you when you lost your tooth/teeth? Were they big?
• Are your feet big? Is one of your feet bigger than the other? Can you show me your left foot?
• Are there mice around your house?