This is an arm.改为复数形式

This is an arm.改为复数形式 This is an orange改为复数句 this is an elephant改为复数 This is an orange.改为复数句. This is an orange改为复数句 this is an elephant改为复数. This is an orange .[改为复数句] This is an English(改为复数句) THIS IS AN ARM.中文意思 This is an Enlish book.(改为复数形式) Is this an English book?改为复数句 this is an apple怎么改为复数句 this is an English book 改为复数句 This is an English map 改为复数形式 This is an orange（改为复数句） This is an egg (改为复数形式） This is an oid car.改为复数词 Is this an action movie?将主语改为复数