【正文】 since D. when【例題5】Will you help him _______ you see an old man lying in the middle of the street?A. though B. when C. because D. unless【例題6】The two boys were walking along the river _______ they heard a shout for help. A. although B. since C. when D. as【例題7】.It is important to know that your brain stores memory_______ you are asleep.A. before B. until C. though D. while【例題8】Mike watched TV_______ he had finished her homework last night.A. before B. while C. after D. then【例題9】Somebody rang me up just now, but he hung up _______ I could answer the phone. A. when B. until C. before D. since【答案】ABCCC知識點四：條件狀語條件狀語從句中的連詞：if, unless(=if…not)a).時態(tài):主將從現(xiàn)(當主句是將來時的時候,從句要用一般現(xiàn)在時）b).主句+ if/unless連接的條件狀語從句，可以和“祈使句+ and/or連接的并列句”互換如： Work hard, or you won’t catch the other students. =Unless you work hard, you won’t catch the other students.★條件狀語從句1．條件狀語從句用一般現(xiàn)在時表示將來。引導條件狀語從句的連詞有： if 如果；unless除非，如果不；on condition that條件是；as long as只要 2．表示正面的條件用if“如果”。 If you don39。t look after young trees, they will die very quickly. 如果你不好好照看小樹苗，它們就會很快死去。 If the museum charges for entry, a lot of people won39。t be able to visit it. 如果進入博物館要收費，許多人就參觀不成了。3．表示否定的條件用unless ( =if.．．not)“除非，如果不”。 I shall not go to the cinema unless I finish my homework before eight. 我不會去看電影，除非我能在8點前完成作業(yè)。 說明：if …not?？梢杂胾nless替代。 If you don’t study hard, you will fail in the exam. You will fail in the exam unless you study hard.4．祈使結構表條件。 前半部分的祈使結構相當于if條件句，可用動詞或名詞開頭；后半部分的簡單句常用一般將來時，有時也用一般現(xiàn)在時。此句型與條件狀語從句形成同義結構。[來源:學*科*網(wǎng)]1) 祈使句( , ) +and/then+簡單句 ＝ if 從句(否定式)+主句 Give me somewhere to stand, and I will move the earth.（如果）給我一個支點，我便能掀動地球。 =If you give me somewhere to stand, I will move the earth. One more word, and I39。ll turn you out. 你再多說一句，我就把你趕出去。 =If you speak one more word, I will turn you out. Use your head, then you39。ll find a way. 動動腦子你就能找到辦法。 =If you use your head, you39。ll find a way.2) 祈使句（,）+or+簡單句 ＝ if 從句(否定式)+主語 Work even harder, or you will never pass the exam. 如果不加倍努力，你就永遠無法通過考試。 = If you don39。t work harder, you will never pass the exam.Stop telling lies, or you will be punished. 如果你繼續(xù)說謊，就會受到懲罰。 = If you don39。t stop telling lies, you will be punished.【例題10】I39。ll go with you if I _______ free tomorrow. A. will be 　　　 B. shall be 　　　C. am 　　　 D. was【例題11】You won39。t know what39。s happening in the world_______you read newspapers every day. A. if B. unless C. because D. after【例題12】You’ll never succeed_______ you don’t work hard.A. if B. until C. unless D. when【例題13】You will be unhealthy if you don39。t do exercise regularly.（保持句意不變） You will be unhealthy_______you_______ exercise regularly.【例題14】Be quick, or you can’t catch the bus. (保持句意基本不變) _______ you _______ quick, you can’t catch the bus.【答案】CBA if…do。Unless…are/If…aren’t知識點五：原因狀語從句引導原因狀語從句的連詞有：because, for, since, as, now that 1）because 意為“因為”，表示直接的原因或理由，著重點在從句，用于回答why，語氣最強，不能與so連用。He is absent today because he is ill. 他今天缺席，因為他病了。I didn39。t go out because I was busy with homework. 我沒有出去，因為我忙于家庭作業(yè)。有時，可用because of后接名詞或代詞表示原因，此時because of=for(介詞)。We won39。t be able to e because of the weather. 由于天氣的原因，我們來不了。She was looking all the better for her stay in hospital. 她因為待在醫(yī)院，顯得好多了。2) for 意為“因為”，引導的從句并不說明主句行為發(fā)生的直接原因，只提供補充說明，且不可位于主句前。for前往往用逗號或分號與主句分開，引起的從句對主句加以解釋。I didn39。t go to see him, for a heavy snow was falling. 我沒有去看他，因為在下大雪。【例題15】I didn’t buy the dictionary yesterday _______ my aunt would give me one .A .until B .because C .if D .before【例題16】Readers won’t be interested in a ic strip_______ it doesn’t have much action. A. if B. when C. unless D. because【答案】B D[來源:.Com]知識點六：讓步狀語從句1．引導讓步狀語從句的連詞有： although, while, even though, even if, whether... (or not), 用no matter十wh/how 引導 2．a(chǎn)lthough／though“雖然”。 Although I didn’t know anybody at the party, I had a very good time. 雖然晚會上的客人我一個也不認識，但我玩得很愉快。 [注意]“although…but”是個典型的錯誤，因為but是并列連詞，不能與從屬連詞although連用。但是，although可與yet，still連用，因為yet，still是副詞，它可使前后關系更明確。【例題17】I remember Dad was still working at desk_______it was very late at night.A. as B. since C. though D. if【例題18】_______the man was badly injured in the fire, he is still alive now.A. Since B. When C. Before D. Although【例題19】— What is your class teacher like? —Oh, he is very kind_______he looks very serious.A. when B. if C. because D. though【例題20】He can hardly understand the English notice_______ he has learned English for many years.A. because B. after C. since D. though【答案】CDDDWashingtoncuts downthe cherry tree.【課堂練習】（此部分測試時間為15分鐘左右，講評時間為10分鐘左右?；蛎Ｆ谥衅谀┛荚囶}。同時歡迎自創(chuàng)！即，可根據(jù)自己的需求，自助創(chuàng)作一些與自己的互動方式相切合并符合知識點回顧的練習題。）Ⅰ.Choose the best answer( )1. Be quick, _______ we’ll be late for school. A. and B. but C. or D. so( )2. Last night, the shop was closed _______ she didn’t buy any chocolate. A. so B. if C. or D. when( )3. The manager thought the old lady was right, _______ he didn39。t take her advice. A. or D. and( )4. Arthur, you will get toothache _______ you clean your teeth regularly. A. unless B. since C. if D. before( )5. We have been good friends _______ we joined the same singing group. A. until B. when C. since D. though( )6.— Would you like to go to the concert with me?— I39。d love to, _______ I can39。t. _______ I have a lot of homework to do.A. and。 Because B. but。 Because C. so。 And D. and。 so( )7. _______ he39。s old, he can still