besides和except的区别

except,besides,except for用法的关联和区别 1.作介词用法时,这三个词都有"除…之外"的含义,但except常与do／does／did／have／has／hadnothing等词形成搭配用法,或者与全部肯定词all、everything、everyone等连用,或者与全部否定词nothing、nobody等连用,因此except加宾语作春毕笑介词"除…之外"时常表示从整体中剔除一部分；而besides作"除…之外"时则表示"另外附加"的含义,相当于"in addition to"。试比较下列例句: 1)He did not hing except watch TV yesterday. 2)He said nothing except to smile just now. 3)All the students took at rip except Tom yesterday. 4)We need 3 more persons to finish the job besides／inaddition to us two. 2.作介词用法时的except后可接多种情况的介词短语。在这种情况下,except后的介词是不可省去的,except加介词的实际作用就相当于连词加相关的从句。例如: 1)The weather is fine today except in the northwest.此数瞎句相当于: The weather is fine today except that it is in the northwest. 2)His mother never takes any exercise except on the dance floor.此句相当于: His mother never takes any exercise except that she has adance on the floor. 需要强调的是except与except for的用法区别: 1)Except后排除的内扒含容与主语往往是同一类的,而exceptfor后所排除的内容与主语往往不是同一类的。例如,试比较: All the buildings are excellent except this one. All the buildings are excellent except for their location或者All the buildings are excellent except that the place on which the buidings are built is notgood. 2)当except用在句首时往往改用except for。例如: There was no single person in the dark street that night except apoliceman on his duty.此句相当于: Except for apoliceman on his duty,there was no single person in the dark street that night. 3.相当于连词用法的except与相当于连词用法的besides的区别仍然保持它们作介词用法的含义。试比较下列例句: 1)Tom is a good student except that he is careless.此句相当于:Tom is a goods tudent except for his carelessness. 2)Tom seldom comes late to school except when it rains hard.此句相当于:Tom seldom comes late to school except on a heavily rainy day