41.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。
42.〔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。
43.〔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.
44.〔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.
45.〔误〕I arrived at New York on July 2nd. 〔正〕I arrived in New York on July 2nd.
〔析〕at用来表达较小的地方，而in用来表达较大的地方。at常用于at the school gate, at home, at a bus stop, at the station, at the cinema, at a small village。