1.clothes統指各種衣服，謂語動詞永遠是複數， cloth指布，為不可數名詞 clothing 服裝的總稱，指一件衣服用a piece of clothes, an article of clothes
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後接不可數名詞， number後接可數名詞 a number of students
4. family, house, home home 家，包括住處和家人，house房子，住宅，family家庭或家庭成員. My family is a happy one.
5. sound, voice, noise sound自然界各種各樣的聲音，voice人的嗓音，noise噪音I hate the loud noise outside.
6. photo, picture, drawing photo用照相機拍攝的照片，picture可指相片，圖片，電影片（英），drawing畫的畫 Let's go and see a good picture.
7. vocabulary, word vocabulary辭彙，一個人擁有的單詞量，word具體的單詞He has a large vocabulary.
8. population, people population人口，人數，people具體的人 China has a large population.
9. weather, climate weather一天內具體的天氣狀況，climate長期的氣候狀況 The climate here is not good for you.
10. road, street, path, way road具體的公路，馬路，street街道，path小路，小徑，way道路，途徑 take this road; in the street, show me the way to the museum.
11. course, subject course課程（可包括多門科目），subject科目（具體的學科）a summer course
12. custom, habit custom傳統風俗，習俗，也可指生活習慣，後接to do，It』s my custom to rise early. habit生活習慣，習慣成自然，後接of doing. I've got the habit of drinking a lot.
13. cause, reason cause 指造成某一事實或現象的直接原因，後接of sth./doing sth，the cause of the fire,也指理由，There is no cause for anxiety. reason用來解釋某種現象或結果的理由，後接for sth./doing sth. the reason for being late
14. exercise, exercises, practice exercise運動，鍛煉（不可數），exercises練習（可數），practice（反覆做的）練習 Practice makes perfect.
15. class, lesson 作"課"解時兩者可以替換.指課文用lesson. 指班級或全體學生用class. lesson 6; class 5
16. speech, talk, lecture speech指在公共場所所做的經過準備的較正式的演說，talk日常生活中的一般的談話，講話，lecture學術性的演講，講課 a series of lecture on…
17. officer, official officer部隊的軍官，official政府官員 an army officer
18. work, job 二者均指工作。work不可數，job可數 a good job
19. couple, pair couple主要指人或動物，pair多指由兩部分組成的東西 a pair of trousers
20. country, nation, state, land country側重指版圖，疆域，nation指人民，國民，民族，state側重指政府，政體，land國土，國家 The whole nation was sad at the news.
21. cook, cooker cook廚師，cooker廚具 He is a good cook.
22. damage, damages damage不可數名詞, 損害，損失; damages複數形式, 賠償金 $900 damages
23. police, policeman police警察的總稱，後接複數謂語動詞，policeman 指某個具體的警察 The police are questioning everyone in the house.
24. problem, question problem常指困難，前面的動詞常為think about, solve, raise，question常指疑問，多和ask, answer連用
25. man, a man man人類，a man一個男人 Man will conquer nature.
26. chick, chicken 二者均可指小雞，chicken還可以當雞肉 The chicken is delicious.
27. telegram, telegraph 當電報解時，telegram指電報內容本身，telegraph指電報這種通訊方式 a telegram, by telegraph
28. trip, journey, travel, voyage travel是最常用的，trip指短期的旅途，journey指稍長的旅途，voyage指海上航行a three-day trip
29. sport, game sport多指戶外的遊戲或娛樂活動，如打球，游泳，打獵，賽馬等；game指決定勝負的遊戲，通常有一套規則 His favorite sport is swimming.
30. price, prize price價格，prize獎，獎品，獎金 win the first prize The price is high/low.
31. a number of, the number of a number of許多，謂語動詞用複數。the number of…的數目，謂語動詞用單數。The number of students is increasing.
32. in front of, in the front of in front of範圍外的前面，in the front of範圍內的前面 In the front of the room sits a boy.
33. of the day, of a day of the day每一天的，當時的，當代的， of a day暫時的，不長久的 a famous scientist of the day
34. three of us, the three of us three of us我們（不止三個）中的三個，the three of us我們三個（就三個人）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，不用冠詞，on the bus表在公共汽車上 They went there by bus.
36. for a moment, for the moment for a moment 片刻，一會兒，for the moment暫時，一時 Thinking for a moment, he agreed.
37. next year, the next year next year將來時間狀語，the next year過去將來時間狀語 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不止一年（兩年或三年等）
39. take advice, take the(one's) advice take advice徵求意見，take the advice接受忠告 He refused to take the advice and failed again.
40. take air, take the air take air傳播，走漏，take the air到戶外去，散步 We take the air every day.
41. in a word, in words in a word總之，一句話， in words口頭上 In a word, you are right.
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，一般用作狀語；in the secret知道內情，知道秘密， 一般用作表語 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一個女孩 Can one girl carry such a big box?
45. take a chair, take the chair take a chair相當於sit down坐下，take the chair開始開會
46. go to sea, by sea, by the sea go to sea當海員，出航，by sea乘船，由海路， by the sea在海邊 go by sea
47. the doctor and teacher, the doctor and the teacher the doctor and teacher指一個人，既是醫生又是老師，the doctor and the teacher兩個人，一個醫生和一個老師 the doctor and teacher is
48. in office/out of office, in the office/out of the office in office在職的，in the office在辦公室里 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，負責照料， in the charge of由……照料 He is in charge of the matter. The matter is in the charge of her.