1.This is my friend 否定句: This isn't my friend. 一般疑问句:Is this your friend ? 回答:Yes, it is. 2.肯定句: That is her telephone. 否定句:That isn't her telephone. 一般疑问句:Is that her telephone? 回答:No. it isn't 3. 肯定句:These are his uncles. 否定句: These aren't his uncles 一般疑问句:Are these his uncles? 回答:Yes, they are. 4. 肯定句:Those are my green jackets. 否定句:Those aren't my green jackets.一般疑问句:Are those your green jackets? 回答:No, they aren't. 3.