1. clothes, cloth, clothing
10. 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.
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. amount, number
amount 后接不可数名词;
number 后接可数名词 a number of students
3. 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.
4. cause, reason
cause 指造成某一事实或现象的直接原因，后接 of sth./doing sthreason 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.
5. 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.
6. officer, official
officer 部队的军官，
official 政府官员 an army officer
7. work, job
work 不可数; job 可数 a good job
8. cook, cooker
cook 厨师; cooker 厨具 He is a good cook.
9. problem, question
problem 常指困难，前面的动词常为 think about, solve, raise，question 常指疑问，多和 ask, answer 连用clothing 服装的总称，指一件衣服用 a piece of, an article of
2. amount, number
amount 后接不可数名词;
number 后接可数名词 a number of students
3. 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.
4. cause, reason
cause 指造成某一事实或现象的直接原因，后接 of sth./doing sthreason 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.
5. 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.
6. officer, official
officer 部队的军官，
official 政府官员 an army officer
7. work, job
work 不可数; job 可数 a good job
8. cook, cooker
cook 厨师; cooker 厨具 He is a good cook.
9. problem, question
10. 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.
