[析] 中文经常讲两小时之后来取，两天内会修好，而这个介词在英文中要用in而不要用after。其原因有二，①after 多用于过去时，如：I arrived in New York. After three days, I found a job in the bank. ② after 加时间是表达一个不确定的时间范围，如：after three days, 即三天之后的哪一天都可以。所以在许诺若干时间内会完成某事时，一定要用介词in。
[误] Three days after he died.
[正] After three days he died.
[正] Three days later he died.
[析] after 与 later都可以用来表达一段时间之后，但它们所处的位置不同，after 在时间词前，而later在时间词后。
[误] She hid herself after the tree.
[正] She hid herself behind the tree.
[析] after多用来表达某动作之后，所以有的语法书中称它为动态介词，如：I run after him. After finishing my homework, I went to see a film. 而behind则多用于静态事物之后。
[误] There is a beautiful bird on the tree.
[正] There is a beautiful bird in the tree.
[析] 树上长出的果实，树叶要用on, 而其他外来的人、物体均要用in the tree.
[误] Shanghai is on the east of China.
[正] Shanghai is in the east of China.
[析] 在表达地理位置时有3个介词：in, on, to。 in表示在某范围之内; on表示与某地区接壤;to则表示不相接。如：Japan is to the east of China.
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