句子的結構

(2)地點狀語從句
引導地點狀語從句的連詞為：where，wherever。
where there is smoke, there is fire.
無風不起浪。
he is now living in a house where lu xun once lived.
他現在住在一所魯迅曾經居住過的房子里。
wherever he went, he always took an umbrella with him.
不管他到哪里去，他總是隨身帶著一把傘。
(3)原因狀語從句
通常引導原因狀語從句的連詞有：because，for，as，since，now that等；而in that，fo r the reason that，seeing (that)，considering (that)等引導狀語從句，多用于書面語 。
she didn't get on that bus because it was too crowded.
她沒有上那輛公共汽車，因為車上太擠了。
they hurried to finish their work, for it was getting dark.
他們趕忙結束自己手里的活，因為天快黑了。
as i knew nothing about him, i didn't say anything to the policeman.
由于我對他的情況一無所知，我沒有對警察說什么。
since it was raining, i had to stay at home.
由于下雨，我只好呆在家里。
注意：because，for，as，since強調原因的程度，依次遞減；because強調直接的原因，for表示附加的或推斷的原因，as表示明顯的原因，since表示眾所周 知的原因。
另外，凡用because的句子，都不再用so。
now that you've been to america, tell us something about it.
既然你去過美國，給我們講講那里的情況。
seeing that the woman was in need of help, we went up to her.
看到那位婦女需要幫助，我們朝她走過去。
注意：當原因狀語從句的主語與主句的主語相同時，可以使用介詞短 語、分詞短語或不定式短語代替從句。
he was blamed for being late again. (介詞短語)
(he was blamed because he was late again.)
他因再次遲到而受到責備。
being worried about her daughter, she decided to go there to see what happened. (分詞短語)
(because she was worried about her daughter, she decided to go t here to see what happened.)
由于擔心她的女兒，她決定親自去那里看看發生了什么事。
she was foolish to have given him so much money. (不定式 短語)
(she was foolish because she gave him so much money.)
她真蠢，給了他那么多錢。
(4)條件狀語從句
表示主句謂語動作發生的條件、推測或意愿。常用的連詞有：if，unless，suppose，as far as，as long as，in case，except，on condition(that)等。這類從句中，如果主句用一般將來時，從句應該用一般現在時。
if you don't hurry, you will miss the train.
如果你不快一些，你就趕不上那趟火車了。
unless you work harder at your study, you won't be able to get t he diploma.
除非你在學習上更努力一些，否則你不能拿到文憑。
suppose she doesn't come, what shall we do?
假如她不來，我們怎么辦?
she is quite a kind woman, as far as i know.
據我所知，她是一個非常賢惠的女人。
(5)方式狀語從句
引導方式狀語從句的連詞有：as，as if，as though，in the way等。
she looked at me as if i was a stranger.
她看看我就好像我是一個陌生人。