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［误］ He came to London before last weekend.
［正］ He had come to London before last weekend.
［正］ He came to London two weeks ago.
［析］ before 一般要与完成时连用，而ago则与一般过去时连用。
［误］ I have studied English for three years gince I had come here.
［正］ I have studied English for three years since I came here.
［析］ since用来表达主句动作的开始时间，所以其引出的从句中应为过去时，而不能用完成时态
［误］ I can help you repair this bike. You will get it after two hours.
［正］ I can help you repair this bike. You will get it in two hours.
［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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