(1) ask of意为“向(某人) 问(某事)；向(某人) 要求(某事)；请求(某人) 做(某事)”。
- I ask this question mainly of young boys.
我主要是向小伙子们问这个问题。 - I would like to ask a favor of you.
我想请你帮个忙。 - It's not too much to ask of you to wash your own clothes.
要求你自己的衣服自己洗，这不算过分。
(2) demand from意为“向(某人) 要求(某物)”，是硬性或强行要求某种东西。
- The thieves demanded money from the passengers.
窃贼们向乘客要钱。 - The captain demanded obedience from his men.
船长要求手下人服从他。
(3) demand of是“向(某人) 提出(某种要求)；要求(某人) 做(某事)”。
- Hard work will be demanded of students in this course.
要学习这一课程，学生们得刻苦用功。 - The increased population is demanding too much of the electricity supply.
新增的人口对电力提出了过高的要求。 - Is it wrong for the police to demand help of the public in fighting violent crime?
在跟暴力犯罪做斗争时，警察要求公众给予帮助是不对的吗？
(4) expect from/of意为“指望(某人)会做(某事)；对……有……期望”。
- Don't expect sudden improvements from/of this class.
不要指望这个班会猛然有进步。 - We all expect great things of you.
我们都对你抱有殷切的期望。
(5) request from/of意为“请求(某人) 做(某事)”，在语气上更接近ask of。
- May I request/ask a favor of you?
我可以请你帮个忙吗？ - It's not too much to request of you to wash your own clothes.
自己的衣服自己洗，这对你的要求不算过高。
(6) require of也表示“要求(某人) 做(某事)”，与demand of更接近一些。
- Hard work will be required of students in this course.
要学习这一课程，学生们得刻苦用功。 - The teacher required of the students that they should know all about the battles of their nation's history.
老师要求学生了解自己国家历史上的所有战役。
