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e to develop. 科學(xué)家認(rèn)為,從大氣中吸取二氧化碳,并向空氣中釋放氧氣,有助于生命的發(fā)展。 3. Whether we help him or not, he will fail. 不論我們幫助他與否,他都將失敗。 I think(that) you have much to improve in English. 我認(rèn)為你的英語需要提高的有很多。 同位語從句和定語從句的區(qū)別: that作為關(guān)系代詞,可以引導(dǎo)定語從句,充當(dāng)句子成分,在從句中作賓語時(shí)可以省略。) 可用于同位語從句的名詞有advice、demand、doubt、fact、hope、idea、information、message、news、order、problem、promise、question、request、suggestion、truth、wish、word等抽象名詞。 注意:because,as if 和 as though在名詞性從句中只能引導(dǎo)表語從句?! he fact is that we have lost the game. 事實(shí)是我們已經(jīng)輸了這場(chǎng)比賽?! e must never think (that) we are good in everything while others are good in nothing. 我們決不能認(rèn)為自己什么都好,別人什么都不好?! t作形式主語:有時(shí)為避免句子頭重腳輕,常用形式主語it代替主語從句作形式主語放于句首,而把主語從句置于句末。 一. 名詞性從句的連接詞 引導(dǎo)名詞性從句的連接詞可分為四類: 1. that(無含義,不充當(dāng)成分) 2. whether, if(有“是否”的含義,但不充當(dāng)成分) 3. 連接代詞:what, whatever, who, whoever, whom, whomever,whose, which,whichever.(在從句中做主語、賓語、表語和定語) 連接副詞:when, whenever,where,wherever, how, however,why(在從句中做狀語) 4. as if,as though,because(不充當(dāng)成分,在名詞性從句中只引導(dǎo)表語從句) 二. 四類名詞性從句語法要點(diǎn) 在整個(gè)句子中用作主語的從句叫主語從句?! ?. Dick found himself walking in the direction of the church. 迪克發(fā)現(xiàn)自己不知不覺朝教堂方向走去?! ?. Permit me to say a few words. 請(qǐng)?jiān)试S我說幾句話?! ?. I have a lot of work to do. 我有很多工作要做?! ?. Which food contains more sugar? 哪一種食物含有更多的糖? 4. What could have happened? 可能發(fā)生了什么事? 5. Something terrible must have happened if Maochang was not ing to eat with him as he always did. 要是茂昌不像往常那樣和他一起吃飯,那問題一定嚴(yán)重了。如: He told us he used to play football when he was young. 2. had better意為“最好”,后接不帶to的不定式?! ! ∑? ought to的用法 1. ought to表示應(yīng)該?! ?. 用“will be”和“will(would) + have + 過去分詞”的結(jié)構(gòu)表示推測(cè),主要用于第二、三人稱。意為“竟會(huì)”?! 、踫hall用于第二、第三人稱,表示說話人給對(duì)方命令、警告、允諾或威脅?! ∽⒁猓簄eedn\\\\\\\\\\\\\\\\\’t + 不定式的完成式“表示本來不必做某事而實(shí)際上做了某事” 2. dare作情態(tài)動(dòng)詞時(shí),主要用于疑問句、否定句和條件狀語從句中,一般不用在肯定句中。它的否定或疑問式用can代替must?! ∪? must和have to的用法 1. 表示必須、必要。在日??谡Z中,用Can I ... 征詢對(duì)方意見在現(xiàn)代口語中更為常見。 4. 用在疑問句及否定句中,表示驚訝,不相信等?! ∽⒁猓孩賑ould也可表示請(qǐng)求,語氣委婉,主要用于疑問句,不可用于肯定句,答語應(yīng)用can?! ?. The most energetic and important festivals are the ones that look forward to the end of winter and to the ing of spring. 最富生氣而又最重要的節(jié)日,就是告別冬天、迎來春天的日子?! ?. In Japan the festival is called Obon,when people should go to clean the graves and light incense in memory of their ancestors.(非限制性定語從句) 在日本,這個(gè)節(jié)叫孟蘭盆節(jié),在這個(gè)節(jié)日里,人們要上墳、掃墓、燒香,以緬懷祖先。 2. Some festival are held to honour the dead, or satisfy and please the ancestors, who could return either to help or to do harm. 還有一些節(jié)日,是為了紀(jì)念死者、滿足或取悅祖先,因?yàn)?祖先們)有可能回到世上幫助他們,也有可能帶來危害?! ?. In India there is a national