時(shí)間狀語從句的要點(diǎn)和難點(diǎn)

1、狀語從句指句子用作狀語時(shí)，起副詞作用的句子。它可以修飾謂語、非謂語動(dòng)詞、定語、狀語或整個(gè)句子。根據(jù)其作用可分為時(shí)間、地點(diǎn)、原因、條件、目的、結(jié)果、讓步、方式和比較等從句。狀語從句一般由連詞從屬連詞引導(dǎo)，也可以由詞組引起。從句位于句首或句中時(shí)通常用逗號(hào)與主句隔開，位于句尾時(shí)可以不用逗號(hào)隔開。 時(shí)間狀語從句 要點(diǎn): 時(shí)間狀語從句，由以下連詞引導(dǎo)： when ，while， as， after， before， as soon as， since， till /until ，by the time 在時(shí)間狀語從句中，要注意時(shí)態(tài) 一致。一般情況下主句是將來時(shí)的時(shí)候，從句要用一般現(xiàn)在時(shí)。 1. when

2、 當(dāng)。的時(shí)候 Mozart started writing music when he was four years old.當(dāng)莫扎特的時(shí)候，開 始寫音樂作品。 2. while 當(dāng)。時(shí) He visited a lot of places while he was traveling.他在旅途中參觀了許多地方。 3. as 在。的同時(shí)；一邊。一邊。 He smiled as he stood up.他一邊站起來一邊笑著。 4. after 在。之后 He left the classroom after he had finished his homework the other day.前

3、幾天 做完作業(yè)之后回的家。 5. before 在。之前 Mr. Brown had worked in a bank for a year before he came here.布朗先生來這 之前已經(jīng)在一家銀行里工作一年了。 6. as soon as 一。就。 We began to work as soon as we got there.我們一到那就開始工作。I will write to you as soon as I get home.我一到家就給你寫信。 7. since 自。以來 到現(xiàn)在表示自過去的一個(gè)起點(diǎn)時(shí)間到目前說話時(shí)間 為止的一段持續(xù)時(shí)間。主句一般用現(xiàn)在完成時(shí)，從句用

4、一般過去時(shí)。Mr Green has taught in that school since he came to china three years ago.自格林先生來中國以來，他就在這所學(xué)校教書。還可以用作介詞，本句從句還可以用短語：since three years ago自三年前以來表示。8 till /until 都可以作連詞，連接時(shí)間狀語，也可以作介詞，與其它詞構(gòu)成介詞短語，在句中作狀語。They walked till /until it was dark.他們一直走到天黑。Xiao Ming didnt leave home till / until his father c

5、ame back.小明直到他爸爸回來才離開家。8. by the 。 為time 到。 。 止 所在句子的主句應(yīng)用完成時(shí)By the time he gets there his father has already gone.他到家的時(shí)候，他爸爸已經(jīng)走了。By the time I got to school the class had already began.我到校時(shí)，已經(jīng)開始上課了。難點(diǎn)as when while 的辨析 as when while 都表示主、從句動(dòng)作同時(shí)發(fā)生，三者差異如下：表示“一邊。一邊”的意思 as 強(qiáng)調(diào)兩個(gè)動(dòng)作同時(shí)進(jìn)行，并表示對(duì)比時(shí) 用于發(fā)生時(shí)間較段時(shí) whe

6、n 1、還可以表示從句動(dòng)詞的動(dòng)作在主幾句動(dòng)詞的動(dòng)作”之前 ”或”之后”發(fā)生。 whenand then at that 2、moment 正在那個(gè)時(shí)候while 1、用于時(shí)間較長時(shí) 2、 強(qiáng)調(diào)兩個(gè)動(dòng)作同時(shí)進(jìn)行，并表示對(duì)比時(shí)有時(shí)這三個(gè)連詞可以互換，有時(shí)不可以。 It was raining hard when as I got there.我到那里時(shí)，正在下大雨。 動(dòng)作同時(shí)發(fā)生，when 可換為 as 但不能換為 while，因?yàn)?get 是點(diǎn)動(dòng)詞. When I had read the article he called me.我看完這篇文章之后，她給我打了電話。 從句動(dòng)作發(fā)生在主句之前，注

7、意時(shí)態(tài)表達(dá)，只能用 when When I got to the cinema the film had begun.當(dāng)我到了電影院時(shí)，電影已經(jīng)開演了。從句的動(dòng)作發(fā)生在主句之后，只能用 when并要注意時(shí)態(tài)He was about to leave when the telephone rang.他正要離開，忽然電話響了。 此時(shí)不能放在句首。主句動(dòng)詞一般表達(dá) “正在” “即將”.while as 不能代替 考點(diǎn) She thought I was talking about her daughter while in fact I was talking about my daughter.她

8、以為我在談她女兒，然而，實(shí)際上在談?wù)撐遗畠骸１磙D(zhuǎn)折，對(duì)比，when as 都不能代替它 考點(diǎn) While the alien was buying a souvenir the girl called the police. 外星人買紀(jì)念品時(shí)，那女孩給警察打了電話。表示主句，從句的動(dòng)作同時(shí)發(fā)生，while 后引導(dǎo)的狀語從句的動(dòng)詞必須是延續(xù)動(dòng)詞不能是點(diǎn)動(dòng)詞，因?yàn)樗硎据^長時(shí)間考點(diǎn) Mother was worried because little Alice was ill especially as when/ while father was away.媽媽擔(dān)心，因?yàn)樾埯惤z病了，特別是他父親不在家的時(shí)候。 此時(shí) as when while 可通用 知識(shí)擴(kuò)展 1. it is since 從。以來多長時(shí)間了，因?yàn)?since 從句或名詞，表示一段時(shí)間It is five years since we met last time.從我們上次見面已經(jīng)五年了。 2.