Tom,youmustbrushyour_(tooth)beforegoingtobed

问题描述:

Tom,youmustbrushyour_(tooth)beforegoingtobed

teeth
tooth是单数形式,其复数为teeth.刷牙不会只刷一颗,所以要说brush your teeth.
另外,goose(鹅)的复数形式为geese.foot(脚)的复数形式为feet.