1. clothes, cloth, clothing
clothes统指各种衣服，谓语动词永远是复数
cloth指布，为不可数名词
clothing服装的总称，指一件衣服用a piece of, an article of
2. incident, accident
incident指小事件, accident指不幸的事故
He was killed in the accident.
3. amount, number
amount后接不可数名词，
number后接可数名词 a number of students
4. sound, voice, noise
sound自然界各种各样的声音，
voice人的嗓音，
noise噪音I hate the loud noise outside.
5. photo, picture, drawing
photo用照相机拍摄的照片，
picture可指相片，图片，电影片，
drawing画的画
Let's go and see a good picture.
6. weather, climate
weather一天内具体的天气状况，
climate长期的气候状况
The climate here is not good for you.
7. road, street, path, way
road具体的公路，马路，
street街道，
path小路，小径，
way道路，途径
take this road; in the street, show me the way to the museum.
8. course, subject
course课程（可包括多门科目），
subject科目（具体的学科）a summer course
9. custom, habit
custom传统风俗，习俗，也可指生活习惯，后接to do，
habit生活习惯，习惯成自然，后接of doing.
I've got the habit of drinking a lot.
10. cause, reason
cause指造成某一事实或现象的直接原因，后接of sth./doing sth，
reason用来解释某种现象或结果的理由，后接for sth./doing sth. the reason for being late
11. exercise, exercises, practice
exercise运动，锻炼（不可数），
exercises练习（可数），
practice（反复做的）练习 Practice makes perfect.
12. class, lesson
作"课"解时,两者可以替换.指课文用lesson.
指班级或全体学生用class. lesson 6; class 5
13. speech, talk, lecture
speech指在公共场所所做的经过准备的较正式的演说，
talk日常生活中的一般的谈话，讲话，
lecture学术性的演讲，讲课 a series of lecture on…
14. work, job
二者均指工作。work不可数，job可数 a good job
15. couple, pair
couple主要指人或动物，
pair多指由两部分组成的东西 a pair of trousers
16. country, nation, state, land
country侧重指版图，疆域，nation指人民，国民，民族，state侧重指政府，政体，land国土，国家
The whole nation was sad at the news.
17. cook, cooker
cook厨师，cooker厨具 He is a good cook.
18. damage, damages
damage不可数名词,损害，损失; damages复数形式,赔偿金 $900 damages
19. police, policeman
police警察的总称，后接复数谓语动词，policeman指某个具体的警察
The police are questioning everyone in the house.
20. problem, question
problem常和困难连系，前面的动词常为think about, solve, raise，question常和疑问连系，多和ask, answer连用
21. trip, journey, travel
travel是最常用的，trip指短期的旅途，journey指稍长的旅途， a three-day trip
22. sport, game
sport多指户外的游戏或娱乐活动，如打球，游泳，打猎，赛马等；
game指决定胜负的游戏，通常有一套规则 His favorite sport is swimming.
23. price, prize
price价格，prize奖，奖品，奖金
win the first prize The price is high/low.
24. a number of, the number of
a number of许多，谓语动词用复数。
the number of…的数目，谓语动词用单数。
The number of students is increasing.
25. in front of, in the front of
in front of范围外的前面，
in the front of范围内的前面
In the front of the room sits a boy.
26. for a moment, for the moment
for a moment片刻，一会儿，
for the moment暂时，一时
Thinking for a moment, he agreed.
27. next year, the next year
next year将来时间状语，the next year过去将来时间状语
He said he would go abroad the next year.
28. more than a year, more than one year
more than a year一年多，more than one year超过一年（两年或三年等）
29. take advice, take the(one's) advice
take advice征求意见，take the advice接受忠告
He refused to take the advice and failed again.
30. take air, take the air
take air传播，走漏，take the air到户外去，散步
31. in a word, in words
in a word总之，一句话，
in words口头上 In a word, you are right.
32. in place of, in the place of
in place of代替，in the place of在…地方
A new building is built in the place of the old one.
33. in secret, in the secret
in secret秘密地，暗自地，偷偷地，一般用作状语；in the secret知道内情，知道秘密，一般用作表语 My mother was in the secret from the beginning.
34. go to sea, by sea, by the sea
go to sea当海员，出航，
by sea乘船，由海路，
by the sea在海边
go by sea
35. the doctor and teacher, the doctor and the teacher
the doctor and teacher指一个人，既是医生又是老师，
the doctor and the teacher两个人，一个医生和一个老师
the doctor and teacher is
36. in office, in the officein office在职的，in the office在办公室里He is in office, not out ofoffice.
37. in bed, on the bedin bed卧在床上，on the bed在床上The book is on the bed. Heis ill in bed.
38. in charge of, in the charge ofin charge of管理，负责照料，in the charge of由……照料He is in charge of thematter. The matter is in the charge of her.
39. in class, in the classin class在课上，in the class在班级里He is the best student inthe class.
40. on fire, on the fireon fire着火,on the fire在火上Put the food on the fire.The house is on fire.
41. out of question, out of the questionout of question毫无疑问的，out of the question不可能的
42. a second, the seconda second又一，再一，the second第……He won the second prize.
43. it, oneit同一物体，one同类不同一I lost my pen. I have to buy a new one.
44. that, thisthat指代上文所提到的，this导出下文所要说的I was ill. That's why…
45. none, nothing, no onenone强调有多少，nothing, no one强调有没有，nothing指物，no one指人--- How many…/How much…? --- None.
46. anyone, any oneanyone指人，不能接of，any one指人物均可，可接of any one of you
47. who, whatwho指姓名或关系，what指职业或地位What is your dad? He is a teacher.
48. what, whichwhat的选择基础是无限制的，which在一定范围内进行选择Which do you prefer, bananas or apples?
49. not a little, not a bitnot a little非常，not a bit一点也不I'm not a bit tired.我一点儿也不累。
50. by oneself, for oneself, to oneself, of oneselfby oneself单独的，独自的，for oneself为自己，to oneself供自己用的，of oneself自行的，自动的The door opened of itself.
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