1. clothes, cloth, clothing
clothes統(tǒng)指各種衣服，謂語動(dòng)詞永遠(yuǎn)是復(fù)數(shù)，
cloth指布，為不可數(shù)名詞
clothing 服裝的總稱，指一件衣服用
a piece of, an article of
2. amount, number
amount后接不可數(shù)名詞，
number后接可數(shù)名詞
a number of students
3. 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.
4. cause, reason
cause 指造成某一事實(shí)或現(xiàn)象的直接原因，
后接of sth./doing sth，
reason用來解釋某種現(xiàn)象或結(jié)果的理由，
后接for sth./doing sth. the reason for being late
5. exercise, exercises, practice
exercise運(yùn)動(dòng)，鍛煉（不可數(shù)），
exercises練習(xí)（可數(shù)），
practice（反復(fù)做的）練習(xí)
Practice makes perfect.
6. officer, official
officer部隊(duì)的軍官，
official政府官員
an army officer
7. work, job
二者均指工作。
work不可數(shù)，job可數(shù) a good job
8. cook, cooker
cook廚師，cooker廚具
He is a good cook.
9. problem, question
problem常和困難聯(lián)系，
前面的動(dòng)詞常為think about, solve, raise，
question常和疑問聯(lián)系
多和ask, answer連用
10. a number of, the number of
a number of許多，謂語動(dòng)詞用復(fù)數(shù)。
the number of…的數(shù)目，謂語動(dòng)詞用單數(shù)。
The number of students is increasing.
11. chick, chicken
二者均可指小雞，
chicken還可以當(dāng)雞肉
The chicken is delicious.
12. 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
13. in front of, in the front of
in front of范圍外的前面
in the front of范圍內(nèi)的前面
In the front of the room sits a boy.
14. three of us, the three of us
three of us我們（不止三個(gè)）中的三個(gè)，
the three of us我們?nèi)齻€(gè)（就三個(gè)人）
The three of us---Tom, Jack and I went to the cinema.
15. by bus, on the bus
by bus表手段，方式，不用冠詞，
on the bus表范圍
They went there by bus.
16. for a moment, for the moment
for a moment 片刻，一會(huì)兒，
for the moment暫時(shí)，一時(shí)
Thinking for a moment, he agreed.
17. in a word, in words
in a word總之，一句話，
in words口頭上
In a word, you are right.
18. 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.
19. go to sea, by sea, by the sea
go to sea當(dāng)海員，出航，
by sea乘船，由海路，
by the sea在海邊 go by sea
20. the doctor and teacher, the doctor and the teacher
the doctor and teacher
指一個(gè)人，既是醫(yī)生又是老師，
the doctor and the teacher
兩個(gè)人，一個(gè)醫(yī)生和一個(gè)老師
來源：網(wǎng)絡(luò)
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