it's an English book.English 在句中的作用

it's an English book.English 在句中的作用 It's an English book.（改为复数句） It's an english book.复数形式 It's my an English book 句型转换1 It's an English book.（改为负数句）____________ __________Eng It's an English book.(改为复数） It‘s an English book.（前面的问句） 连词成句:is,an,english,book,it? It is an English book(改为否定句） 连词成句 is it mary's book english not 改为复数形式 Is that an English book?What"s this in English?It is It's an english book.复数形式为什么是They are English books