In preparation for lectures,I urge you to do some reading.里的prepare为什么用名词形式

问题描述:

In preparation for lectures,I urge you to do some reading.里的prepare为什么用名词形式
为某事做准备,不是用动词形式吗

介词后加名词或动名词,而prepare 本身有名词形式,故用prepaeation.