one of the problems facing mankind today is racism. 这句话中的facing与mankind主谓关系是什么特殊用法吗?另外,face的主语可以是物吗?比如to alleviate the challenge facing the special problem中的facing是challenge的定语吗?
不定式可以做定语,例如:The boy to write this letter needs a pen. (to write this letter 为定语,修饰名词boy) /写这封信的男孩需要一支钢笔。There is nothing to do today.(to do为定语,修饰名词nothing)/今天没有事要做。请教一下老师,什么情...