Earlier,theBabylonianshadattemptedtomaptheworld,buttheypresenteditintheformofaflatteneddiscratherthanasphere,whichwastheformadoptedbyPtolemy.更早之前,巴比伦人曾试图绘制世界地图,但是他们把它绘制

Question

Earlier ,the Babylonians had attempted to map the world ,but they presented it in the form of a flattened disc rather than a sphere ,which was the form adopted by Ptolemy .更早之前,巴比伦人曾试图绘制世界地图,但是他们把它绘制成平盘状而不是托勒密所采用的球体状.
我的问题是：最后一句中 （which was the form adopted by Ptolemy ）的 the form 做什么成分?was adopted by 不就是构成被动语态吗?为什么把the form 摆在这个位置呢?

Answer 1

the form 做表语,adopted by Ptolemy 是过去分词做定语,修饰the form
看一下面的例子：
I read a book written by Luxun in 1927