单复数互换：1This is a pen.2.Are these oranges?3.What's that in English?4.Is this an apple?5.Are these pencils?

单复数互换：1This is a pen.2.Are these oranges?3.What's that in English?4.Is this an apple?5.Are these pencils? (1)This is a pen.(2)Are these oranges?（3）What's that in English?（4）Is this an apple?单复数互换还有一个 Are these pencils? Is this your English book?单复数互换 this is a pen.改为复数句 This is a pen.(改为复数形式) 单复数句互换1、That is a key.2、They＇re English girls.3、What color is your jacket?4、He is my friend.5、It＇s a black pen. This is pen变复数 This is a pen改为否定句,改为单复数转换改为一般疑问句或提问,肯定句做回答. This is a pen 变为复数如题 Is this a pen?（变复数句） This is a pen变为复数句,怎么变 This is his pen.复数形式 this.is pen变复数句 This is a pen and that is a knife改为复数形式 This is an apple.that is a pen.改复数形式 this is a my pen This is a nice pen. 英语 改复数句This is a pen.Is this your backpack?It's a black bag