51. 〔误〕Im sorry. I have to get out the bus at next stop. 〔正〕Im sorry. I have to get out of the bus at next stop.
〔析〕get in, 与 get out是两个相反的词组。get in 为上车，而get out为下车，但语法家认为这里的in与out为副词，所以其后不能接名词，我们可以讲Wed better get in. 或Wed better get out. 还有一组词组有关上下车：get on/off(a train, a ship, a struck) get into/out of (a car, taxi…)
52. 〔误〕Be careful The temperature of the water is ninety degrees over zero. 〔正〕Be careful. The temperature of the water is ninety degrees above zero. 〔析〕over 与 above 在作为比某物高的意思时有时可以互换。但在垂直方向上的高矮时，即正上方时则要用above.而泛指上方时用over.
53.〔误〕The Dead Sea is under the sea level. 〔正〕The Dead Sea is below the sea level.
〔析〕在垂直下方要用below.也就是讲above与below互为反意词，over与under也是反意词。
54. 〔误〕There is a big tree in the front of the house. 〔正〕There is a big tree in front of the house.
in front of 是在物体外部的前面，而in the front of 是在物体内部的前面，如：The driver sits in the front of the bus.
55.〔误〕It took them two days to walk across the forest. 〔正〕It took them two days to walk through the forest.
〔析〕across 作为介词有两个主要意思：①横过，如：I want to walk across the street.②对面，如：There is a post office across the street,而through 多用于三维空间中的穿越。across则多用于平面上的横过。如：The little girl ran across the room to meet her mother.