✔ 最佳答案
"demanded by my teacher" (participle phrase modifying "homework") can be viewed as a reduction of defining relative clause "that was demanded by my teacher".
2014-11-14 02:20:43 補充:
Active voice: My teacher demanded the homework.
Passive voice: The homework was demanded by my teacher.
I am calling the teacher who demanded the homework.
I am calling the teacher demanding the homework.
2014-11-14 02:27:57 補充:
"demanded by my teacher" (participle phrase modifying "homework") can be viewed as a reduction of defining relative clause "that was demanded by my teacher".
I'm doing the homework that was demanded by my teacher.
Passive voice: The homework was demanded by my teacher.
Active voice: My teacher demanded the homework.
Other examples:
I am calling the teacher who demanded the homework.
= (as reduction) I am calling the teacher demanding the homework.