帮忙分析一下下面这个句子的语法

问题描述:

帮忙分析一下下面这个句子的语法
Participants in this enterprise were supplied with bicycles,which they used to deliver parcels and messages,and wich they were required to pay for gradually from their wages.这里的which 应该就是定语从句的先行词了,但是在从句中做什么成分呢?宾语的话也有点别扭啊?

你是吧 used to 看成 情态动词词组了吧“过去常常”
这里不是,which做used(使用)的宾语,to deliver...是目的状语
第二句话,which 做pay for 的宾语(介词宾语)