Question

英语语法高手进!!!

1.请解释to、for之间的区别（请请说出它们的用法并加以举例说明）
2.请解释How long、How soon、How often之间的区别（请说出它们的用法并加以举例说明）

Answer 1

to:
介词 prep. 到；向；往
word that shows where someone or something is going,etc.
· We walked to town.
我们走路进城。
· He leads us from victory to victory.
他领导我们从胜利走向胜利。
· Point to the blackboard.
指着黑板。
· That road leads to Beijing.
那条路通向北京。
· The peach is rotten to the core.
这个桃子烂到核里了。

介词 prep. （表示接受者）给
word that shows who is receiving something
· Please give the book to me.
请把书给我。
· I gave the candy to Mary.
我把糖果给了玛丽。

for
介词 prep. （表示时间、距离）计，达
word that shows how far or how long
· I have waited for three hours.
我等了三小时。
· For much of the time he suffered from bad health.
在很长时间里，他身体都不好。
· They were silent for a while.
他们沉默了一会儿。
· It's time for little girls to be in bed.
小女孩就寝的时间到了。
· We walked(for) a mile and ran (for) a mile.
我们走了一英里，又跑了一英里。

介词 prep. 开往，向
word that shows where someone or something is going
· She left Tianjin for Beijing.
他离开天津上北京去了。
· Is this the train for Glasgow?
这是开往格拉斯哥的火车吗？

介词 prep. 给，与，适于
word that shows who will get or have something
· This is a present for you.
这是给你的礼物。

介词 prep. 当作
as; as being
· I took him for his brother.
我把他当作是他的兄弟。

介词 prep. 因为，由于
by reason of, on account of; because of
· We could not see for the fog.
因为有雾，我们看不见。
· They did not draw the conclusion for the following reason.
由于下述理由他们没有作出结论。
· He was punished for stealing.
他因偷窃而受惩处。

介词 prep. 就…而言
word that shows whom you are talking about
· It is dangerous for a small child to cross the road alone.
小孩子自己过马路危险。
· It's for you to decide.
这件事由你来决定。
· He is tall for his age.
他小小年纪，个子倒挺高。（就他的年纪来说，他的个子算是高的。）

介词 prep. 为了，供
word that shows why you are doing something
· It is very cold for October.
十月里这样的天气真是很冷。
· I have got some picture books for you to look at.
我有一些让你看的书。
· No house was big enough for him to live in.
没有那么大的房子可供他住。
· We work hard for socialism.
我们为社会主义努力工作。

介词 prep. （比赛或战斗时）代表，代，替
on the same side in a sport or fight
· They would run for the United States.
他们将代表美国去参加赛跑。
· Tim plays tennis for his school.
蒂姆代表学校参加网球赛。

介词 prep. 价格，交换
word that shows how much something is
· I want to change this for that.
我想用这个换那个。
· I paid two dollars for the book.
为这本书我付了两元钱。
· I gave 5 pounds for it.
我出五英镑买的。

介词 prep. 赞成，支持
word that shows you like an idea
· Are you for or against the proposal?
你是赞成这个建议还是反对这个建议？
· Some people were for the strike and others were against it.
有些人赞成罢工，另一些人反对。

连词 conj. 因为
because; on account of the fact that
· I am thirsty, for the sun is hot.
我由于天热而口渴。
· I missed the beginning of the play,for I was late.
我没有看到话剧的开头部分，因为我迟到了。

how long表示多长时间: 如
· How long can you stay?
你能呆多久？
how soon表示多久 , 一般问将来的事,如
How soon will you go back?
how often 表示多久一次,用来问频率.如
How often do you go back to you hometown?