This is his pen.复数形式

This is his pen.复数形式 This is a pen.(改为复数形式) This is his cousin.改为复数形式 this is my pen pal改成复数形式 This is pen变复数 This is his cousin.(改为复数形式） IS this his teacher?(改为复数形式） This knife is his.怎么改复数形式的句子? 英语复数形式it this a book,it is a pen,there is a book,以上改成复数形式.those are chair,what are these,以上改成单数is,coat,his,where连词成句，pen,book,watch,foot,man,woman,family,boy,child,girl复数形式，用正确形式 This is an apple.that is a pen.改复数形式 This is a pen and that is a knife改为复数形式 1 it is my pen.2 this is her uncle.3 that schoolbag is mine.4 this deak is his.复数形式.5 that man is her uncle.句型同上。 Is this your pen Is this his pen?选择疑问句 that is his pen变复数句 is that his pen?改为复数 The black pen is his.（复数） It is my pen.(改为复数形式) this.is pen变复数句