be made of VS be made from
A. be made of“由…构成”,能看出原材料(像桌子由木头制成,刀 由铁或金属制成,很明显看出原材料)
① The desk is made of wood.
② The knife is made of metal.
B. be made from“由…构成、制成成品”,被制成的东西看不出原材料 (像纸是由木头制成的,这就看不出)
如：The paper is made from the wood.
confirm VS conform
A. confirm [kən'fɜːm] 确认；确定；证实；批准；使巩固
Research has confirmed that the risk is higher for women.
研究已经证实，这种风险在女性中的比例更高。
B. conform [kən'fɔːm] 使遵守；使一致；使顺从
The laws of nature often don’t see any reason to conform to logic.
我们通常不能在大自然的规律中找到符合逻辑的理由。
sleepy VS asleep
A. sleepy adj. 意为“想睡觉的，困乏的”，“贪睡的,好睡的”可作定语或表语：
The sleepy dog is mine.
那只贪睡的狗是我的.
He goes to bed very late every day, so he often feels sleepy.
他每天睡得很迟，因此经常感到困乏。
B.asleep adj. 意为“睡着的”，用作表语，强调状态；
不能用very修饰,只可用much,fast,sound等词修饰.
有时也可作后置定语.常用短语为fall asleep，意为“入睡”。
He was very tired and was fast asleep.
他很累，很快就睡着了。
obtain VS gain VS acquire
A. obtain,经常表示付出一段时间努力之后"获得"某些东西,譬如说advice, benefits, approval,a degree, information.
E.g Teenagers have to obtain permission from parents before they go out with friends.
青少年需要获得父母的允许才能够和朋友出外。
B. gain 强调获得的东西是对你有利或者有帮助的东西,譬如说the access to something, advantage, benefit, control, insight, knowledge, confidence, support, power等等
E.g Impulse sometimes gains power over nature.
冲动有时候会战胜本性。
C. acquire 强调通过购买或者强夺的手段去获得一些东西,这些东西一般是可见的,譬如说asset, company, status, title, property; acquire 有时候和gain的意思差不多,可以加skill, knowledge, 但是acquire给人的感觉就是获得之后还会长时间占有, 如 acquire knowledge and skills
E.g With thought, practice and feedback, we acquire skills.
有了思考,实践和反馈,我们可以获得技能。
of VS for
of 表从属关系 ； for 表原因、目的
A. 介词Of的用法
（1）所有关系 This is a picture of a classroom
（2）部分关系 a piece of paper / a cup of tea / a glass of water
（3）描写关系 a man of thirty 三十岁的人 / a man of Shanghai 上海人
（4）承受动作 The exploitation of man by man．人对人的剥削.
（5）同位关系 It was a cold spring morning in the city of London in England．
（6）关于,对于 What do you think of Chinese food?
你觉得中国食品怎么样?
B. 介词 for 的用法小结
（1）表示“当作、作为”.
如:I like some bread and milk for breakfast.
我喜欢把面包和牛奶作为早餐。
（2）表示理由或原因,意为“因为、由于”.如:
Thank you for helping me with my math.
谢谢你帮我学习数学。
（3）表示动作的对象或接受者,意为“给……”、“对…… (而言)”.如:
Let me pick it up for you.
让我为你捡起来。
Watching TV too much is bad for your health.
看电视太多有害于你的健康。
（4）表示时间、距离,意为“计、达”.如:
I usually do the running for an hour in the morning.
我早晨通常跑步一小时。
We will stay there for three days.
我们将在那里逗留三天。
（5）表示去向、目的,意为“向、往、取、买”等.如:
Let’s go for a walk.
我们出去散步吧。
I came here for my schoolbag.
我来这儿取书包。
I paid thirty yuan for the dictionary.
我花了30元买这本词典。
（6）表示所属关系或用途,意为“为、适于……的”.如:
It’s time for school.
到上学的时间了。
Here is a letter for you.
这儿有你的一封信。
（7）表示“支持、赞成”.如:
Are you for this plan or against it?
你是支持还是反对这个计划?
（8）用于一些固定搭配中.如:
Who are you waiting for?
你在等谁?
For example,Mr Green is a kind teacher.
比如,格林先生是一位心地善良的老师。
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