1. clothes, cloth, clothing
clothes統指各種衣服，謂語動詞永遠是複數，
cloth指布，爲不可數名詞
clothing 服裝的總稱，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，
drawing畫的畫 Let's go and see a good picture.
7. vocabulary, word
vocabulary詞彙，一個人擁有的單詞量，He has a large vocabulary.
word具體的'單詞
8. population, people
population人口，人數，China has a large population.
people具體的人
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，
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，
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，鍛鍊(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.
