英语语法问题！！！！

Question

A great number of student questioned said they were farced to practise the piano. 句中为什么用question+ed？求分析，谢谢~_~

Answer 1

这里的question表被动语态, 忽略了was.
因此也可以理解为过去分词作形容词. 但由于学生是被问及的对象, 属被动, 因此question需后置并加上ed.
你所理解的句子应该是A great number of student (was) questioned said they were forced to practise the piano.

但如果加上was的话句子就不通顺了
笼统简单一点说:
"A great number of student questioned"整个是主语, 意思是"大多数被问及的学生"
"said"是谓语
"they were forced to practise the piano."说的是这件事, 作宾语

Answer 2

questioned 在这里用作后置定语，意为被提问，被问到，所以此处要用到question的过去分词形式。

Answer 3

这里是用动词分词修饰名词，而这些学生是被问卷调查的，所以是questioned，被动语态。或者你理解它这里省略了a great number of students, who were/had been questioned, said ...

Answer 4

后置定语修饰student