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[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。
[误] There is a big tree in the front of the house.
[正] There is a big tree in front of the house.
[析] 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.
[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.
[误] The sun sets toward the west.
[正] The sun sets in the west.
[析] towards也可用作toward，它主要表达朝向某方向运动，但不一定到达，如：He ran toward(s) the mountain.而在表示方位east, west, north, south 时，其前面要用in。要注意的是这4个词可以用作副词，如：I went south. 也可用作名词，如：I went to the south.也可用作形容词，如：I went to the south part of China.
[误] Do you have no other clothes except those?
[正] Do you have no other clothes besides those?
[析] beside 是"在……旁边"，如：The students stood beside their teachers.而besides是"除……之外，不仅……而且……，除了……以外还有……"， 如：I studied English besides French, when I was in college. 而except 则是从同一类物体中去掉某一部分，如：I come here every day except Sunday. 而except for 是指去掉不同种类的事物，如：The room is clean except for two chairs. 而except that则要加从句。
[误] Can I write the exam paper with ink?
[正] Can I write the exam paper with a pen?
[正] Can I write the exam paper in ink?
[析] with后要加拿得起来放得下的工具，而墨水、颜料等原料则要用in。
[误] I'm earlier today. I came here by his car.
[正] I'm earlier today. I came here in his car.
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