全程设计人教版英语必修1——Unit4 Section Ⅲ.pptVIP

2．As_you_know,_this is the day the quake happened ... 你知道，这一天正是……发生地震的日子。 as you know 是非限制性定语从句， as 代替整个主 句的内容。as 引导非限制性定语从句时放在主句前 后均可，意为“正如”，后边的谓语动词多是 see, know, expect, say, mention, report 等。 ①As you can see, the stamp shows the new city. 你可以看到，这枚邮票展示了这座新城市。 ②She has been absent again, . 她又缺席了，这在预料之中。 ③As was reported last week, the situation in that area had become more serious. 据上周报道，那个地区的形式变得越发严重了。 as is expected 3．The man was sleeping downstairs when the earthquake happened. 那个人正在楼下睡觉，突然发生了地震。 该句中 when 为并列连词，意为“就在这时；突然”， 相当于 and then, just at this time。when作并列连词时， 常用于以下句型中。 (1)sb.was/were doing sth. when ... 某人正在做某事，这时 …… ①I was walking along the street when I heard my name called. 我正在街上走着，突然听到有人叫我。 (2)sb. be about to do sth. when ... 某人正准备做某事，这 时…… ②I when the telephone rang. 我正要出去，这时电话铃声响了。 was just about to go out (3)sb. had just done sth. when ... 某人刚做完某事，这时 …… ③We had just covered less than 20 miles when we were stuck in the storm. 我们刚走了不到20英里，就被困在了暴风雨中。 [对点集训] 1．I had just stepped out of the bathroom and was busily drying myself with a towel ________ I heard the steps. A．while B．when C．since D．after 解析：句意：我刚走出浴室，正忙着用毛巾擦身体，就 在这时我听到了脚步声。 when 用作并列连词，意为“ 正在这时”。 答案：B 2．__________ is reported in the newspaper, talks between the two countries are making progress. A．It B．As C．That D．What 解析：as 引导非限制性定语从句且在从句中作主语； 若用 A 项，应把句中的“，”改为 “that”， 即使整 个句型变成 it 作形式主语， that 引导的主语从句。 答案：B 3．________ is known that those actions that people dislike go against the will of the people. A．As B．It C．What D．That 解析：本句中应用it 作形式主语，真正的主语为 that 从句；若选 A项，应将 that 变为逗号。 答案：B 4．I was about to leave ________ he came back. A．when B．while C．before D．since 解析：be about to ...when ...可看作固定句型，意为“ 正要……这时……”。句意：我正要离开，这时他回 来了。 答案：A [考点精析] 1．frighten vt.使惊吓；吓唬 ①The sudden noise frightened us. 突如其来的噪音使我们吓了一跳。 ②Id never do that; Id . 我绝不会干，我会被吓死的。 ③The