How many are these pears?怎么改?

how many bears are How many derks are how many trees are how many books are how many legs are there? how many stop are there How many pears are there? How many stars are there? How many birdges are there? HOW MANY BOOKS ARE THERE How many people are zhere? How many people are there? How many apples are these how many girls are there How many pig are three? how many hens are there How many monkey are there? how many is和how many are的区别