引導(dǎo)從句（就是它們作連詞conj.的時候）：
for一般表示弱化的因果關(guān)系（即推測原因,語氣不如because強）,不放句首.
例句：We must start early, for it will take two hours to drive to the airport.
我們得早點動身,因為開車去機場得花兩個小時.
as：（5鐘用法）
1、像...一樣;依照;像（和副詞like意義相同用法不同）
例句：You ought to do as Paul tells you.
你應(yīng)按照保羅吩咐的做.
2、當(dāng)...時（和when意義用法相同）
例句：As she left the room she remembered that book.
她離開房間時想起了那本書.
3、隨著（和with意義相同用法不同）
例句：As the sun rose the fog dispersed.
太陽一出來,霧隨之消失.
4.因為（看到嗎,沒有逗號連接,for有逗號）
例句：We didn't know what to do as we were just visiting there.
我們不知道該怎么辦,因為當(dāng)時我們僅僅在那里作訪問.
5、雖然 表轉(zhuǎn)折（就是你所說的倒裝,只有表這個意思才可以,待會兒詳解）
例句：Tired as he was, he sat up late.
他雖然疲倦,可仍然很晚才睡.
though 只有盡管的意思 同as的第五個意思
例句：Though he is rich, his life is not happy.
他雖然很有錢,但生活并不幸福.
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現(xiàn)在來講倒裝
for沒有倒裝用法
as/though是有的
Though, although 的倒裝句

一、名詞+as / though+主語+動詞
King as he was, he was unhappy. 他雖是國王,但他并不幸福.
Child as he is, he knows to help other. 他雖是個孩子,但卻知道幫助別人.
Teacher though he is, he can’t know everything. 他雖然是老師,但也不可能什么都懂.
【說明】其中的動詞通常為連系動詞,也就是說位于句首的名詞是其后連系動詞的表語.另外,要特別注意位于句首的名詞前習(xí)慣上不用冠詞,即使其前有形容詞修飾也不用冠詞.比較：
Boy as [though] he is, he likes to play with girls.=Though [Although] he is a boy, he likes to play with girls. 他雖是男孩,卻喜歡與女孩子玩.
Strong man as [though] he is, General Botha has been severely put to the test during the past few weeks.= Though [Although] he is a strong man, General Botha has been severely put to the test during the past few weeks. 波賽將軍雖然堅強,但在過去的數(shù)周里也受到了嚴(yán)峻的考驗.
二、形容詞+as / though+主語+動詞
Successful as he is, he is not proud. 他雖然成功,但不驕傲.
Improbable as it seems, it’s true. 雖然看起來不太可能,但卻是真的.
Stupid as it sounds,I was so in love with her that I believed her. 盡管聽起來很愚蠢,我是如此愛她竟然相信了她的話.
Patient as he was,he didn’t like waiting that long. 他雖說有耐心,也不愿等這么長.
Beautiful though the necklace was,we thought it was over-priced. 那條項鏈雖然很漂亮,我們認為價錢太高.
【說明】其中的動詞也通常為連系動詞,也就是說位于句首的形容詞是其后連系動詞的表語.
三、副詞+as / though+主語+動詞
Much as I like Paris, I couldn’t live there. 盡管我喜歡巴黎,但我不能住在那里.
Hard though they tried, they couldn’t make her change her mind. 盡管他們做了很大努力,卻沒法讓她改變主意.
Fast as you read, you can’t finish the book in two days. 盡管你讀得很快,你總不能在兩天之內(nèi)就讀完這本書.
He was unable to make much progress, hard as he tried. 盡管他做了努力,卻未能取得很大進步.
【說明】有的詞典將much as 作為習(xí)語看待,認為它是一個用以引導(dǎo)讓步狀語從句的復(fù)合連詞.再如：
Much as I admire him as a writer,I do not like him as a man. 他作為一名作家我很佩服他,但我卻不喜歡他這個人.
Much as I like you, I couldn’t live with you. 我盡管很喜歡你, 卻不能和你在一起生活.
四、動詞原形+as / though+主語+動詞
Object as you may, I’ll go. 縱使你反對,我也要去.
Try as he might, he couldn’t solve the problem. 盡管他想方設(shè)法,卻未解決這個問題.
Search as they would, they would find nobody in the house. 無論怎樣搜查,他們在房子里仍然沒有找到一個人.
Dislike him as we may, we must acknowledge his greatness. 盡管我們不喜歡他,但必須承認他的偉大.
Lose money as I did, we got a lot of experience. 錢雖然丟了,我們卻得到了許多經(jīng)驗.
Fail in the election as he did, he became famous for his fiery speech against slavery. 盡管落選了,但他卻以其反對奴隸制的激烈演說而出了名.
【說明】主語后的動詞通常為may, might, would, did 等情態(tài)動詞或助動詞(若表示情態(tài)意義,則選用情態(tài)動詞；若陳述事實,則用did, do 等助動詞).
五、分詞+as / though+主語+動詞
Raining hard as it is, I’m going out for a walk. 雖然正在下著大雨,我還是要出去散步.
Surrounded as we were by the enemy, we managed to march forward. 雖然我們被敵人包圍著,但我們還是設(shè)法前進了.
Munching the apple as he was, he had got an eye for all John’s movements. 他盡管在一個勁地嚼著蘋果,但仍警惕著約翰的一舉一動.
【三條補充說明】
1. 這類倒裝的讓步狀語從句可用as, though 來引導(dǎo),但不能用although來引導(dǎo)；但是,未倒裝的讓步狀語從句則可用though, although來引導(dǎo),而不能用as來引導(dǎo).也就是說,although引導(dǎo)讓步狀語從句時不能倒裝,as引導(dǎo)讓步狀語從句時必須倒裝,而though引導(dǎo)讓步狀語從句時可以倒裝也可以不倒裝.如：
雖然很晚了,但我們還是繼續(xù)工作.
正：Late as [though] it was, we still went on working.
正：Though [Although] it was late, we still went on working.
誤：Late although it was, we still went on working.
誤：As it was late, we still went on working.
2. 上面提到的倒裝結(jié)構(gòu)有時也可用來表示原因,區(qū)別的辦法主要看句子的內(nèi)容：讓步從句的內(nèi)容大多數(shù)與主句在意義上相反,而原因從句則與主句之間有因果關(guān)系.比較：
Tired as he was, he sat up late studying at night. 昨晚他雖然很疲倦了,但還是學(xué)習(xí)到很晚才睡.(表讓步)
Tired as he was, he went to bed early. 因為很累,所以他睡得很早.(表原因)
Young as he was, he was equal to the task. 他雖年輕,卻能勝任這項工作.(表讓步)
Young as he was, he was not equal to the task. 他因為年輕,所以不能勝任這項工作.(表原因)
3. 在美國英語中,人們通常用as…as引導(dǎo)讓步狀語從句.如：
Cold as it was, we went out.=As cold as it was, we went out. 盡管天氣冷,我們還是出去了.
Successful as he is, he is not proud.=As successful as he is, he is not proud. 他雖成功了,但不驕傲.
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