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［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.
［析］ 在交通工具前加介词by，但不能再有任何指示代词或冠词，否则要改换相应的介词。 by taxi=in a taxi
by train=in a train
by bicycle=on a bicycle
by ship=on a ship
by boat=in a boat
by bus=on a bus
by plane=on a plane
by air 空运
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