nature與natural用法few和little的區別lighted和lit的用法區別a bit和a little的區別a bit 與 a little的用法區別much的用法詳解動詞不定式省略to的情況before的用法介詞across, along, through的區別as good as與as well as的用法區別friend與friendly的搭配對比mind 的用法與搭配convenient的用法do/to do/doing的用法區別keen on doing sth 與keen to do sth 的區別arrive,reach和get to的用法區別be,become,get和turn的用法區別副詞almost與nearly用法比較homework與housework的區別healthy與healthful用法辨析