31. 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.

　　32. 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.

　　33. of the day, of a day

　　of the day 每一天的，當(dāng)時(shí)的，當(dāng)代的，of a day 暫時(shí)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(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.

　　35. 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.

　　36. 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.

　　37. next year, the next year

　　next year 明年，將來時(shí)間狀語，the next year 第二年，過去將來時(shí)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 超過一年(兩年或三年等)

　　39. take advice, take the(one‘s) advice

　　take advice 征求意見，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(nèi)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(gè)女孩 Can one girl carry such a big box?

　　45. take a chair, take the chair

　　take a chair 相當(dāng)于 sit down 坐下，take the chair 開始開會(huì)