英语 单数变复数 That is his pen.（ ） are （ ） pens.第二个空填什么?以及,填那个单词的原

英语 单数变复数 That is his pen.（ ） are （ ） pens.第二个空填什么?以及,填那个单词的原 Thsae are his brothers（变单数形式） That's his friend（变复数形式） Is th that is his pen变复数句 These pens are blue.(变否定句） Is that your photo?(变复数句） This is Is that an egg?变复数 Is it a pen?做否定回答 Those are eraser.变单数 Th 英语的单数变复数this is my friendthat is his watchis she your parent pen的单复数问题单数是a pen 复数two pens 英语句型转换This is my watch （变复数） those are Sams brothers （变单数） S 英语的单数变复数Is she his aunt?是两个人称都变成复数,还是只变主语? This is my pen.(变为复数句）My pens are blue.blue 是划线的 （就划线部分提问） The black pen is his.（复数） is that his pen?改为复数