afford的用法fool与foolish的用法区别asleep的用法习惯damage的用法while和when的区别even though和even if的用法与区别raise和rise的区别和用法不定式的特殊句型too…to…also, too, either, as well的区别如何区别also, too, either与as wellmuch too与too much的用法区别too...to结构和用法总结each和every的区别：词性功能上的异同讲解Me too. 与 You too.的用法never与ever的用法比较before 和ago的用法区别all, every, each的用法区别none of them还是none of whichafternoon, morning, evening用法特点和规律first 与 at first的用法区别