except与exceptfor的用法区别: 1)Except后排除的内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 buidings are built is notgood。
2)当except用在句首时往往改用exceptfor。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。 。
答：一、 except用于表示同类事物之间的关系，其意为"除……以外"、"除去"。 1. except后面可接名词、代词、动词、副词、介词短语和从句等。 We ha...详情>>
答：入射光线与水平面成30度,欲使其水平射出,即可水平向右,也可水平向左,也就是入射光线和反射光线的夹角是120度或60度.作这两个角的角平分线,即为平面镜的位置,...详情>>
