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1. clothes, cloth, clothingclothes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, accidentincident指小事件, accident指不幸的事故 He was killed in the accident.
3. amount, numberamount后接不可数名词， number后接可数名词 a number of students
4. family, house, homehome 家，包括住处和家人，house房子，住宅，family家庭成员. My family is a happy one.
5. sound, voice, noisesound自然界各种各样的声音，voice人的嗓音，noise噪音I hate the loud noise outside.
6. photo, picture, drawingphoto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.
7. vocabulary, wordvocabulary词汇，一个人拥有的单词量，He has a large vocabulary.word具体的单词
8. population, peoplepopulation人口，人数，China has a large population.people具体的人 9. weather, climateweather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.
10. 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.
11. course, subject course课程（可包括多门科目）， subject科目（具体的学科）a summer course
12. 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.
13. 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
14. 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.
15. 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
16. 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…
17. officer, official officer部队的军官， official政府官员 an army officer18. work, job 二者均指工作。work不可数，job可数 a good job
19. 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
20. country, nation, state, land country侧重指版图，疆域， nation指人民，国民，民族，The whole nation was sad at the news state侧重指政府，政体，land国土，国家.
21. cook, cooker cook厨师，cooker厨具 He is a good cook.
22. damage, damages damage不可数名词, 损害，损失; damages复数形式, 赔偿金 $900 damages
23. 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.
24. problem, question problem常和困难；联系，前面的动词常为think about, solve, raise， question常和疑问联系，多和ask, answer连用
25. man, a man man人类，a man一个男人 Man will conquer nature.
26. chick, chicken 二者均可指小鸡，chicken还可以当鸡肉 The chicken is delicious.
27. telegram, telegraph 当电报解时，telegram指具体的，telegraph指抽象的 a telegram, by telegraph
28. trip, journey, travel, voyage travel是最常用的， trip指短期的旅途，a three-day trip journey指稍长的旅途， voyage指海上航行
29. 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.
30. price, prize price价格， prize奖，奖品，奖金 win the first prize The price is high/low. 31. 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.
32. 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.
33. of the day, of a day of the day每一天的，当时的，当代的， of a day暂时的，不长久的 a famous scientist of the day
34. three of us, the three of us three of us我们（不止三个）中的三个， the three of us我们三个（就三个人） The three of us---Tom, Jack and I went to the cinema.
35. by bus, on the bus by bus表手段，方式，不用冠词， on the bus表范围 They went there by bus.
36. 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.
37. 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.
38. 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）
39. 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.
40. take air, take the air take air传播，走漏， take the air到户外去，散步 We take the air every day.
41. in a word, in words in a word总之，一句话， In a word, you are right in words口头上.
42. 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.
43. 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.
44. a girl, one girl a girl可泛指所有女孩, one girl一个女孩 Can one girl carry such a big box?45. take a chair, take the chair take a chair相当于sit down坐下， take the chair开始开会
46. 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
47. 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
48. in office, in the office in office在职的， in the office在办公室里 He is in office, not out of office.
49. in bed, on the bed in bed卧在床上， on the bed在床上 The book is on the bed. He is ill in bed.
50. in charge of, in the charge of in charge of管理，负责照料， in the charge of由……照料 He is in charge of the matter. The matter is in the charge of her.