Concerned的用法
      When concerned means 'worried' it is followed by about, e.g. 
      （當concerned解作“表示擔憂”時，在它後面應用about這前置詞，例如：）
      The mother is concerned about her child's health.
      （那母親很擔心孩子的健康。）
      When it means 'having to do with' it is followed by with, e.g.（當concerned解“與某事有關”時，它後面的置詞是with，例如：）
      Don't ask me! I'm not concerned with this matter.
      （不要問我！這事與我無關。）
      Beside和Besides的用法
      These tow words are different in meaning. Beside means 'be the side of', as in:（這兩個字的意思並不相同，Beside 解在旁邊，例如：）
      The little girl sat beside her mother.
      （那小女孩坐在她媽媽旁邊。）

      Besides is also a preposition, but it means 'in addition to', e.g.（Besides也是一個前置詞，但解作“除此之外”，例如：）
      Besides being a top student, he is an outstanding athlete.
      （他除了是個高材生外，還是一個出色的運動員。）
      There are other factors to conside, besides money.
      （除了金錢之外，還有其他因素要考慮。）
      Besides can also be used as adverb. When it is used in this way it means 'moreover'.
      （Besides也可作副詞用，如果它是副詞的話，它的意思和moreover差不多。）
      I don't like the look of this car; besides, it is too expensive.
      （我不喜歡這輛車的外型，還有，它太昂貴了。）