一道英语分析题

警察要求其供述所有事情的这个贼一直保持着沉默

the thief是先行词，the police demanded to tell everything he had done是修饰the thief的定语从句，the thief在从句里是做demanded的宾语。还原了就是：the police demanded the thief to tell everything he had done.

这种句子首先要找出主干，本句中主语是the thief,谓语是kept silence
中间那部分是用来修饰The thief的也就是做定语。