2017届高考英语一轮复习《全优课堂》模块知识总复习课件：必修2 unit 3《Computers》（新人教版）
<p> 2．<span word="I">I</span> <span word="developed">developed</span> <span word="very">very</span> <span word="slowly">slowly</span> <span word="and">and</span> <span word="it">it</span> <span word="took">took</span> <span word="nearly">nearly</span> <span word="two">two</span> <span word="hundred">hundred</span> <span word="years">years</span> <span word="before">before</span> <span word="I">I</span> <span word="was">was</span> <span word="built">built</span> <span word="as">as</span> <span word="an">an</span> <span word="analytical">analytical</span> <span word="machine">machine</span> <span word="by">by</span> <span word="Charles">Charles</span> <span word="Babbage">Babbage</span>. 我发展很慢，差不多到了两百年之后，查尔斯·巴比奇才将我制成了一台分析机。</p><p> 句型提炼： <span word="before">before</span>引导的时间状语从句 (1)“<span word="It">It</span> <span word="took">took</span>＋一段时间＋<span word="before">before</span>＋从句(一般过去时)”句型，表示“过了一段时间后才……”。该句型中的主句谓语动词多使用<span word="be">be</span>动词。 (2)<span word="It">It</span> <span word="will">will</span> (<span word="not">not</span>) <span word="be">be</span>＋时间段＋<span word="before">before</span>＋从句(现在时)表示“要过一段时间后才……(用不了一段时间就……)”。 【句型剖析】</p><p> (3)<span word="It">It</span> <span word="was">was</span> (<span word="not">not</span>) ＋时间段＋<span word="before">before</span>＋从句(过去时)表示“过了一段时间后才……(没过一段时间就……)”。 (4)<span word="It">It</span> <span word="is">is</span>/<span word="has">has</span> <span word="been">been</span>＋时间段＋<span word="since">since</span>＋一般过去时，表示“自从……已多长时间了”。 (5)<span word="It">It</span> <span word="was">was</span>＋时间段＋<span word="since">since</span>(从句用过去完成时) 表示“自从……已多长时间了”。 <span word="It">It</span> <span word="was">was</span> <span word="three">three</span> <span word="weeks">weeks</span> <span word="before">before</span> <span word="the">the</span> <span word="problem">problem</span> <span word="was">was</span> <span word="solved">solved</span>. 过了三周问题才得到了解决。 <span word="The">The</span> <span word="young">young</span> <span word="man">man</span> <span word="rushed">rushed</span> <span word="out">out</span> <span word="before">before</span> <span word="I">I</span> <span word="could">could</span> <span word="tell">tell</span> <span word="him">him</span> <span word="the">the</span> <span word="news">news</span>. 我还没来得及告诉他这个消息，这个年轻人就冲了出去。 <span word="It">It</span> <span word="has">has</span> <span word="been">been</span> <span word="three">three</span> <span word="months">months</span> <span word="years">years</span> <span word="since">since</span> <span word="I">I</span> <span word="applied">applied</span> <span word="for">for</span> <span word="the">the</span> <span word="job">job</span>. 我申请这份工作已经三个月了。 【即时巩固】 语法填空 ①<span word="It">It</span> <span word="took">took</span> <span word="about">about</span> <span word="four">four</span> <span word="months">months</span> ____________ <span word="the">the</span> <span word="explorer">explorer</span> <span word="found">found</span> <span word="the">the</span> <span word="new">new</span> <span word="land">land</span>. ②<span word="It">It</span> <span word="will">will</span> <span word="be">be</span> <span word="long">long</span> <span word="before">before</span> <span word="he">he</span> ____________ (<span word="master">master</span>) <span word="all">all</span> <span word="the">the</span> <span word="advanced">advanced</span> <span word="technology">technology</span>. ③<span word="It">It</span> <span word="is">is</span> <span word="six">six</span> <span word="years">years</span> ____________<span word="such">such</span> <span word="deadly">deadly</span> <span word="diseases">diseases</span> <span word="arose">arose</span>. 【答案】①<span word="before">before</span> ②<span word="masters">masters</span> ③<span word="since">since</span></p>
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