名词单数变复数Whats this in English? Its an apple. What are these? They are two apples.-What are these? -Whats this? -Its a pen. -They are pens.-What are those? -Whats that? -Its an English book. -They are English books.backpacks watches oranges pens -Whatre these ? -Theyre .maps cases keys -Whatre those ? -Theyre .单数 复数 可数名词 如何变化？ 规则变化 不规则变化 规则变化1.一般情况下，直接在词尾加-s 构成复数形式。 car backpack cars backpacks book books 1.name pen card ruler names pens cards rulersbox 2. 以s, x, ch, sh等结尾的名词， 在词尾加-es构成复数形式。 boxes
