语法 were held fixed

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/10 22:35:32

语法 were held fixed
He also decided that if an electric current in a wire could move a magnet,then if the magnet were held fixed,and the wire allowed to be mobile,then a current flowing in the wire should cause it to move.
if the magnet were held fixed这句中FIXED是什么用法为什么不是TO BE FIXED

if the magnet were held fixed中的fixed是主语（the magnet）的补语；主语补语是由主动语态中的宾语补足语变化而来的.比如if the magnet were held fixed这句话如果使用主动语态,我们可以这样说：if we(主语) hold（谓语） the magnet（宾语） fixed（宾语补足语）.但是在科技文章中,一般是没有动作的执行者的,也就是说句子的主语一般不会是“人”,所以被动语态用得就多.
这句话里不用to be fixed是因为不定式一般表示将要做的动作.if the magnet were held fixed的意思是“如果将磁体/铁固定”,而不是if the magnet were held to be fixed“如果磁体/铁将要（被）固定”吧.（我对这种专业性的内容是外行,见笑.）

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