Is there a cure for cancer?Yes, there is. Is there a sixth sense?Yes, there is. Is there a company called Apple?Yes, there is. Are there any volunteers?Yes,there are. Are there any rules to follow?Yes...答错了！例如该这样1. There is a hospital behind my house.否定：There isn't a hospital behind my house.你是要肯定句和否定句，对吗？对There is a car in front of the house.There isn't a car in front of the house. There is a little water in the bottle.There isn't a little water in the bottle. There is a company called Apple.There isn't a company called Apple. There are at least three.There aren't at least three. There are many good museums.There aren't many good museums. There are so many students in the classroom.There aren't so many students in the classroom. There was a dog sleeping under the old tree yesterday.There wasn't a dog sleeping under the old tree yesterday. There were some books on the deskThere weren't some books on the desk..There were some apples in the bag.There weren't some apples in the bag. There were some children playing football near that red house just now.There weren't some children playing football near that red house just now. There were many bookshops last year.There weren't many bookshops last year. There were a lot of children playing in the yard last night.There weren't a lot of children playing in the yard last night.希望可以帮到你！