写作技巧—— 四六级英语400个英语语法公式

after+表示时间段的名词用于过去时，表示多长时间之后。

●The old man left home in 1924 and came back after thirty years.

那位老人1924年离开家，30年后才回来。

on/in/above/over+名词意为“在......上面”

●There is a picture on the wall.

墙上有幅画。

●The plane flew above the clouds. 

飞机在云层之上飞行。

through/across/past/over+名词意为“穿过/经过/跨过某地”。

●I drive past a big supermarket to the office every day.

我每天开车去上班时都经过一家大超市。

betwveen/among+名词意为“在.....之间”。

●Some students often listen to music between classes to refresh themselves.

一些学生通常在课间听音乐来放松自己。

except/besides/except for+名词意为“除了.......之外”。

●The office is open every day except Sundays.

这个办事处除了星期天之外天天都开门。

with/by/in+表示方式、工具的名词意为“用....来做”。

●I cut the cake with the knife.

我用刀子把蛋糕切开。

be busy (in)doing sth.意为“忙于做某事”。

●We're busy (in) doing homework after school every day.

我们每天放学后都忙于做作业。

have difficulty/trouble (in) doing sth.意为“做某事有困难"。

●I have some trouble (in) working out this problem.

解出这道题我有些困难。

stop/prevent...(from) doing sth.意为"阻......做某事”.

●We must stop him (from) going to swim in the river.

我们必须阻止他去河里游泳。

be(of)+种类、数量、度量、种族、国籍类名词

●Machines are (of) different types and sizes.

机器有不同的型号和规格。