高一英語(yǔ)：三四單元重難點(diǎn)句型歸納二

2016-12-07 23:11:51 來(lái)源：逍遙右腦記憶網(wǎng)

　　3. Before she could move，she heard a loud noise. 她還沒(méi)有來(lái)得及動(dòng)彈，就聽(tīng)見(jiàn)很響的聲音。

　　However, before she could think twice, the water was upon her. 但還沒(méi)有回過(guò)身來(lái)，洪水便逼近了她。

　　該兩句中的before用作連詞，后接時(shí)間狀語(yǔ)從句。before用作連詞，接時(shí)間狀語(yǔ)從句時(shí)，表示“在……之前”。但在不同的語(yǔ)境中，往往有比較靈活的譯法。例如: He knocked me down before he saw me. 他差一點(diǎn)把我撞倒，才看到我。

　　【考例】The American Civil War lasted four years the North won in the end.

　　A. after B. before C. when D. then

　　[考查目標(biāo)] 時(shí)間狀語(yǔ)從句的引導(dǎo)詞選擇。

　　[答案與解析]B before 表示“直到……”。

　　4. Tree after tree went down, cut down by the water, which must have been three meters deep. 洪水想必深達(dá)三米，樹一棵接一棵地倒了，被洪水沖斷了。

　　該句中的must have been表示推測(cè)。例如：You look so tired. You must have stayed up last night.

　　情態(tài)動(dòng)詞may，might，most.can，could常用來(lái)表示推測(cè)。may，might，must多用在肯定句中，can，could多用在否定句和疑問(wèn)句中。may，might，must，can，could后接動(dòng)詞原形表示對(duì)現(xiàn)在的推測(cè);may，might，must，can，could后接have done。表示對(duì)過(guò)去的推測(cè)。例如：

　　You may be a professor. / She must have met a fairy.

　　【考例】This cake is very sweet. You ____ a lot of sugar in it.

　　A. should put B. could have put

　　C. might put D. must have put

　　[考查目標(biāo)] 情態(tài)動(dòng)詞表示推測(cè)。

　　[答案與解析] D 前文說(shuō)蛋糕很甜，由此可知一定是糖

　　放多了。對(duì)于過(guò)去的動(dòng)作的推測(cè)應(yīng)使用have done的

　　結(jié)構(gòu)，所以應(yīng)在B、D之間做選擇，又因?yàn)閏ould have

　　done表示本可以做而沒(méi)有做，所以選擇D。

　　(責(zé)任編輯：康彥林)