【正文】 首，而till 不能。As is reported，it is over 100 years since Qinghua University was founded．正如所報(bào)道的，清華大學(xué)自建立以來已有一百多年了。(2)since意為“自……以來”，常用句式：It is/ has been＋一段時(shí)間＋ since從句(常用過去時(shí))。t be/ wasn39。2．before，since的用法(1)before表示“在……之前；還未……就……；還沒有來得及……就……”。while“當(dāng)……時(shí)候”，一般只可與延續(xù)性動(dòng)詞連用，從句動(dòng)作與主句動(dòng)作同時(shí)發(fā)生Mary made coffee while her guests were finishing their meal．客人們就要吃完飯的時(shí)候，瑪麗去煮咖啡了。(4)sb．had just done sth． when．．．某人剛做完某事，這時(shí)……I had just finished sweeping the floor when the telephone rang．我剛剛掃完地，這時(shí)電話鈴響了。(2)sb．be about to do sth． when．．．某人正要做某事，這時(shí)……We were about to set off when it suddenly began to rain．我們正打算動(dòng)身，突然下起雨來了。3．when構(gòu)成的句型when引起并列句，意為“正在這時(shí)”，表示某件事正在發(fā)生或剛要發(fā)生或剛剛完成時(shí)，突然發(fā)生另一動(dòng)作。More healthy food，or (else) you39。ll regret．抓住這次機(jī)會(huì)，否則你會(huì)后悔的。2．or (else)構(gòu)成的句型 (1)祈使句＋or (else)＋陳述句。Another try，and you39。Work hard，and you will succeed．(＝ If you work hard，you will succeed．)努力學(xué)習(xí)，你就會(huì)成功。He must have been caught in the rain，for he is wet all over．他肯定被雨淋了，因?yàn)樗麥喩矶紳窳?。He tried hard to catch up with his classmates，but he failed．他盡力趕上同學(xué)們，但是失敗了。m openminded and warmhearted，so I39。專題八　并列句和狀語從句　　考點(diǎn)精講 　　并列句考點(diǎn)一常見并列句的類型及并列連詞類型并列連詞并列關(guān)系(遞進(jìn)關(guān)系)and，both．．．a(chǎn)nd．．．，not only．．．but also．．．，neither．．．nor．．．等轉(zhuǎn)折或?qū)Ρ汝P(guān)系but，yet，whereas，while等選擇關(guān)系or，or else，either．．．or．．．，not ．．．but．．．等因果關(guān)系for，so等Both Peter and Tom are from South Africa．彼得和湯姆都來自南非。First，my English is very good and I39。m getting along well with everyone．首先，我的英語很好，而且我性格外向、很熱心，因此我和每個(gè)人都相處得很好。The children can go with us，or they can stay in．孩子們可以跟我們?nèi)?，也可以待在家。考點(diǎn)二并列連詞構(gòu)成的常用句型1．a(chǎn)nd構(gòu)成的句型(1)祈使句＋and＋陳述句(祈使句相當(dāng)于一個(gè)條件狀語從句，and后面的句子相當(dāng)于一個(gè)表示結(jié)果的主句)。(2)名詞詞組＋and＋陳述句(名詞詞組相當(dāng)于一個(gè)條件狀語從句，其中常含有more，another等詞)。ll make a success．再試一次，你就會(huì)取得成功。Seize the chance，or (else) you39。(2)名詞詞組＋or (else)＋陳述句。ll break down sooner or later．多吃健康食品，不然你的身體遲早會(huì)垮掉。(1)sb．be doing sth． when．．．某人正在做某事，這時(shí)……Last Monday，I was walking in the street when I suddenly saw an old man fall off his bicycle．上周一，我正在街上散步，這時(shí)我突然看到一位老人從自行車上摔了下來。(3)sb． be on the point of doing sth． when．．．某人正要做某事，這時(shí)……She was on the point of going to bed when someone knocked at the door．她正要上床睡覺，突然有人敲門?！　钫Z從句考點(diǎn)一時(shí)間狀語從句1．when，while和as的用法連詞含義及用法例句when“當(dāng)……時(shí)候”，可與延續(xù)性動(dòng)詞或短暫性動(dòng)詞連用；從句動(dòng)作可以發(fā)生在主句動(dòng)作之前、之后或與主句動(dòng)作同時(shí)發(fā)生When you apply for a job，you must present your certificates．當(dāng)你申請(qǐng)工作時(shí)，你必須遞交你的有關(guān)證件。as“隨著……”，常與延續(xù)性動(dòng)詞連用，從句動(dòng)作與主句動(dòng)作同時(shí)或幾乎同時(shí)發(fā)生As he grew older，he became less active．隨著他逐漸長(zhǎng)大，他變得不那么活潑了。常用句式：①It will be/was＋一段時(shí)間＋before．．．要過/過了……時(shí)間才……；②It won39。t＋一段時(shí)間＋ before．．．沒過多久就……We need to get to the root of the problem before we can solve it．在我們解決問題之前，我們需要找到問題的根源。since 從句的時(shí)態(tài)若是一般過去時(shí)，主句的時(shí)態(tài)常用現(xiàn)在完成時(shí)或現(xiàn)在完成進(jìn)行時(shí)。3．till/until的用法till/until用于肯定句表示“直到……為止”，其主句謂語動(dòng)詞必須為延續(xù)性動(dòng)詞；not．．． until/till．．．表示“直到……才……”，not所在的主句的謂語動(dòng)詞必須為非延續(xù)性動(dòng)詞。If you don39。She didn39。4．表示“一……就……”的連詞(1)as soon as，the moment，the minute，the instant，immediately，directly等The moment my aunt gained her diploma after four years of hard work，she was filled with joy．我阿姨苦讀四年之后獲得了文憑，那一刻她欣喜萬分。I had hardly got to the office when my wi