41. in a word, in words

　in a word总之，一句话， in words口头上 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 built¹ in the place of the old one.

43. in secret², in the secret

　in secret秘密地，暗自地，偷偷地，一般用作状语；in the secret知道内情，知道秘密，

一般用作表语 My mother was³ in the secret from the beginning⁴.

44. a girl, one girl

　a girl可泛指所有女孩, one girl一个女孩 Can one girl carry such⁵ a big box?

45. take a chair, take the chair

　take a chair相当于sit down坐下，take the chair开始开会

46. go to sea, by sea, by the sea

　go to sea当海员，出航，by sea乘船，由海路， by the sea在海边 go by sea

47. the doctor and teacher, the doctor and the teacher

　the doctor and teacher指一个人，既是医生又是老师，the doctor and the teacher两个人，一个医生和一个老师 the doctor and teacher is

48. in office, in the office

　in office在职的，in the office在办公室里 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 charge⁶ of, in the charge of

　in charge of管理，负责照料， in the charge of由……照料 He is in charge of the matter. The matter is in the charge of her.