This isn't an English book.变复数.Are they rulers?变单数.How is he

This isn't an English book.变复数.Are they rulers?变单数.How is he they are an English book变单数 单数句变复数句This is a box.This is a bus.Tt is a ruler.This isn't 变单数或复数It is English bus.They are cute babies.The women are g 英语复数变单数的句子They are English teachers. 英语句子单数变复数1、Is that her English book?(改成复数)2、Those aren't Chi How is he?Her sister is a student.This isn't an English car. This set of rulers is blue 变复数句 七年级英语句型转换单数变复数句子20道题如问：are they enjlish books?答：Is it an Eng 改成复数句This is a book.That isn't an egg.Is this a book?Yes,is this is an eraser 变复数.快 This isn't my brother 变复数形式