2016屆高考英語主從復合句(狀語從句、名詞性從句和定語從句)

　　重點內容如下：　　①when,while,as引導的時間狀語從句　　▲as表示“當……的時候”，往往和when/ while通用，但它著重強調主句與從句的動作或事情同時或幾乎同時發生。　　she came up as i was cooking.(同時)　　the runners started as the gun went off.(幾乎同時)　　▲when(at or during the time that )既可以表示在某一點的時候，又可表示在某一段時間內，主句與從句的動作或事情可以同時發生也可以先后發生。　　it was raining when we arrived.(指時間點)　　when we were at school, we went to the library every day.(在一段時間內)　　when we arrived there,the film had already begun.(先后發生)　　▲while意思是“當……的時候”或“在某一段時間里”。主句中的動作或事情在從句中的動作或事情的進展過程中發生，從句中的動詞一般要用延續性動詞。在when表示a period of time時，兩者可以互換。　　please don’t talk so loud while/when others are working.　　he fell asleep while/when reading.　　strike while the iron is hot.( 不可用as或when，這里的while意思是“趁……”)　　②before狀語從句的重點句型　　▲……之后……才：it was a long time before i got to sleep .　　▲不多久……就：it wasn’t long before he told me about the affair.　　▲不等……就：before i could get in a word, he had measured me.　　▲剛……就：he hardly entered the room before he heard the telephone ring.　　▲先……再：you can have a few days to think about it before you make your decision.　　③since 引導的從句用延續性動詞的過去式(包括過去完成時)，則從句的動作已經結束,從句意思是否定的。如果從句的動詞是延續性的用完成時態，從句意思是肯定的。　　▲he has never been to see me since i was ill.我病愈后，他一直未來看我。(不在生病了)　　▲he has never been to see me since i have been ill.我病了，他一直未來看我。　　▲i haven’t heard from him since he lived here.　　自從他這里搬走，我就沒有收到他的信。(不住在這兒了)　　▲i know him very well since he has lived here near us.自他住在我們附近以來，我對他很了解。　　▲it’s three years since i was in the army.我退伍已三年了。(不在服役了)　　▲it’s three years since i have been in the army=it's three years since he joined the army.　　我入伍已三年了。　　④如果與till與until從句使用的主句是肯定的，則主句中謂語要用延續性動詞如果與其使用的主句是否肯定的，則主句中謂語要用短暫性動詞。另till從句不可以置于句首，只有until從句可以放在句首。not until 放在句首時主句要倒裝。　　2.原因狀語從句　　由下列連詞引導：as(由于),because(因為), since(既然),now (that) (既然), considering that(顧及到), seeing that(由于)。　　i do it because i like it.因為我喜歡我才干。(because不能與 so連用)　　he couldn’t have seen me, because i was not there.他不可能見過我，因為當時我不在那兒。