保证准确率！
1. There is a rubber in the pencil case.
否定句：There isn't a rubber in the pencil case.
一般疑问句：Is there a rubber in the pencil case?
肯定回答：Yes, there is.
否定回答：No, there isn't.
注：句中的a rubber 也可以说成 an eraser，pencil case 也可以换写成 pencil-box
2. There are two watches in the schoolbag.
否定句：There aren't two watches in the schoolbag.
一般疑问句：Are there two watches in the schoolbag?
肯定回答：Yes, there are.
否定回答：No, there aren't.
注：句中的schoolbag 也可以换写成 bag.
3. She has three lunch boxes.
否定句：She doesn't have three lunch boxes.
一般疑问句：Does she have three lunch boxes?
肯定回答：Yes, she does.
否定回答：No, she doesn't.
注：“某人有某物”用have，“某物或某处有某物”用there be
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