from和out of常常表示动机或原因;through表示消极或间接的原因。
He feels weak from lack of sleep.
He broke down through overwork.
4.表示目的的介词
for表示拟定的接收人或目的;to表示实际的接收人或目的。
I bought the gift for my little sister.
I gave the gift to my little sister.
for和to都可以引导目的地。For跟在含有出发或开始意义的动词后,如:leave, set out,
start, depart, sail等;to跟在含有来来往往地行动的意义的动词后,如:go, come, run ,walk,
move, fly, drive, ride等。
We have left for Hong Kong.
He flew to America via Hong Kong.
at表示起因;on表示依据。
She is quite pleased at his help.
Ken was arrested on a charge of that.
at还可引导行为的目标或精力的集中点。
He shot at the bird.
5.表示“关于……”的介词
一般about用于比较随便的谈话或非正式的文体;on用于正式的讲话、著作或报告中;of用于动词talk, read, know, say, hear, boast等的后面。如:
What are you talking about?
A paper on serfdom in Russian
In terms of natural resources
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