Make a plural: Your (tooth) will hurt if you don't wash them.
teeth
Make a plural: (Child) should go to sleep before 10 P.M.
children
Make a plural: I see two (man) and three (woman) in the bus.
men / women
Make a plural: How many (bus) will drive us to Paris?
buses
I have one sandwich. How many (sandwich) do you have?
sandwiches
I have one fish. How many _____ do you have?
fish