【正文】 y did man know what heat 世紀(jì)初，人類才知道熱能是什么。2)Until when 疑問句中，until要放在句首。I didn39。s get in the wheat before the sun sets.）否定句：She didn39。正確使用這兩個(gè)連詞的關(guān)鍵之一就在于判斷句中的動(dòng)詞該用肯定式還是否定式。比較until和till此兩個(gè)連詞意義相同。注：while也可以作并列連詞，表轉(zhuǎn)折的關(guān)系，相當(dāng)于but，譯為“然而”。ll tell him about it as soon as he es 。(stay表示的動(dòng)作可以持續(xù))He didn39。（4）.until 意為“直到??時(shí)”，引導(dǎo)時(shí)間狀語從句時(shí)，表示主句的動(dòng)作發(fā)生在從句的動(dòng)作之前。We haven39。t throw them （們）用過了塑料袋之后，不準(zhǔn)到處亂扔。例如：We cleaned the classroom before we left school ，我們打掃了教室。Just as / Just when / When I stopped my car, a man came up to ）當(dāng)從句的動(dòng)作發(fā)生于主句動(dòng)作之前，只能用when 引導(dǎo)這個(gè)從句，不可用as 或 while。注：when也可以作并列連詞，表示一個(gè)動(dòng)詞正在進(jìn)行的時(shí)候，突然間發(fā)生了另外一件事。He was working at the table when I went ，他正在桌旁工作。凡是從句都必須有引導(dǎo)詞，引導(dǎo)時(shí)間狀語從句的詞有 when, before, after, until, as soon as, while 等，具體用法如下：（1）.when 意為“當(dāng)??時(shí)”，引導(dǎo)時(shí)間狀語從句，表示主句的動(dòng)作和從句的動(dòng)作同時(shí)或先后發(fā)生。作什么樣的狀語就叫什么類型的狀語從句。）I would do it with pleasure, except that I am too busy.（要不是我太忙了，我會(huì)很高興去做的。t speak the way as other people bodies are made up of millions of very small cells, just as a building is made of many stones or speaks French as if(as though)he were a as if 或 as though 引導(dǎo)的從句通常用虛擬語氣，但如果主句謂語是感官動(dòng)詞，并且所述情況實(shí)現(xiàn)可能性大，也可用陳述語氣，如：It looks as if the ing autumn harvest will be even better than the last 主要由 as...as, not so(as)...as, than 等連詞引導(dǎo)，如：This table is as wide as that can not run so(as)fast as conducts electricity better than other of Proportion and Other Types(比例從句和其它從句)比例從句由關(guān)聯(lián)詞 the...the...連接形容詞或副詞比較級(jí)構(gòu)成，如：The more she thought about it, the more she liked 如 as...so 和 what...that 引導(dǎo)的類比從句；so(as)far as 引導(dǎo)的范圍從句；except that 引導(dǎo)的例外從句；rather / sooner than 和 would / had rather than 引導(dǎo)的擇比從句等，如：As the desert is like a sea, so is the camel like a ship.（沙漠似海，駱駝似舟。這些連詞與 as, since 意思相近，通常用于書面語，并且它們兼有其它意義。t work hard.)Supposing / Suppose it rains, shall we have the match as scheduled?In case you need anything else, please let me 由 although, though, even though, even if, whether...or, while, as, whwords + ever(= no matter + whwords)等從屬連詞引導(dǎo)，如：He is quite modest though he is the best student in the needle has the same mass whether it is hot or (No matter which)plan you adopt, you will meet with ：(though)不可與連詞 but 連用； 引導(dǎo)的從句意義和 though 相似，但表示的語氣較強(qiáng)，并須將強(qiáng)調(diào)的詞放在句首（但不用 although），如：Simple as(though)the question may seem, it is not at all mon in / no matter how 引導(dǎo)的從句中，however / no matter how 后須緊跟形容詞或副詞，如：However / No matter how hard I tried, I couldn39。五、比較狀語從句中的省略She can play the piano just as wonderfully as you(do).她鋼琴彈的我你彈的一樣好。There are few people nowadays, if(there are)any, who remember 。He will e if(he is)，他就來。我們不可說As walking, she found a nice shining thing on the 、地點(diǎn)狀語從句中的省略地點(diǎn)狀語從句的省略常用下列結(jié)構(gòu)：where(ver)possible, where(ver)necessary，Lay these books where possible you can find them 。Don’t e in until(you are)asked 。第一篇：狀語從句的省略規(guī)則一、時(shí)間狀語從句中的省略When(she was)very young, she began to learn to play the ，就開始學(xué)習(xí)彈鋼琴。Before leaving, turn off all the lights.(Before you leave, turn off all the lights.)走之前，請(qǐng)關(guān)閉所有的燈。注：as在引導(dǎo)時(shí)間狀語從句時(shí)，沒有這種省略現(xiàn)象。如：Send the goods now if(they are)，請(qǐng)送過來。If(it is)true, this will casue us a lot of ，這會(huì)給我們帶來很多麻煩。Even if(I am)invited to, I won’t go to such a bad ，我都不想聽如此壞的報(bào)告。ll tell would have succeeded if you had tried will fail unless you work hard.(=You will fail if you don39。as 和 since 表示明顯的、已知的原因，since 比 as 正式，如：They had to move because their building was to be pulled Mary was the eldest, she looked after the they live near the sea, they often go ． now that, seeing(that), considering(that), in that。t be any mistakes.)Clauses of Manner and Comparison(方式和比較從句)方式從句主要由 just as, as, as if, as though 等連詞引導(dǎo)，如：He doesn39。）As(So)far as I know, he is an honest man.（據(jù)我所知，他是一個(gè)誠實(shí)的人。）第三篇：狀語從句1狀語從句一：什么是狀語從句？用一個(gè)句子(從句)來作另一個(gè)句子(主句)的狀語，用作狀語的句子就叫作狀語從句。when引導(dǎo)的時(shí)間狀語從句，when的從句可以用延續(xù)性動(dòng)詞，也可以用點(diǎn)動(dòng)詞。I worked for a foreign pany when I was in ，我為一家外國企業(yè)工作。比較while, when, as1）as, when 引導(dǎo)短暫性動(dòng)作的動(dòng)詞。（2）.before 意為“在??之前”，引導(dǎo)時(shí)間狀語從句時(shí)，表示主句的動(dòng)作發(fā)生在從句的動(dòng)作之前。例如：After you use plastic bags, you mustn39。We have made many dumplings since we began to ，我們已經(jīng)包了許多餃子了。It is six