高中英语 unit 4 section ⅱ learning about language 精品课件 新人教版必修4 课件VIP免费

Section Learning about LanguageⅡAs a result of this event, a great dust cloud formed in thesky blocking out the sunlight. 因为这一事件，一大团尘埃在空中形成，挡住了阳光。1 ． block out 挡住 ( 光线 )典例 That wall blocks out all the light. 那堵墙把光线都遮住了。运用 完成句子block outWe use a curtain to ________________ ( 挡住 ) the sunshine.that a comet crashed into the earth long ago and causedthe disappearance 很久以前一颗彗星撞上了地球并造成了这种灭绝2 ． crash vi.& vt. 碰撞；坠落典例 The motorcycle crashed into the fence.摩托车猛地撞在了围栏上。拓展 crash into 撞上；闯入运用 完成句子 The plane ________________ ( 撞上了 ) the mountain.crashed into主语从句主语从句在复合句中作句子的主语。主语从句的引导词有：连接代词： who, what, which, whoever, whatever, whichever连接副词： when, where, why, how 等从属连词： that, if/whether一、由连接代词和连接副词引导的主语从句连接代词和连接副词在引导主语从句时，既起连接作用，又保留自己的疑问含义，在从句中充当主语、宾语、表语、定语、状语等成分。如：What they are after is money.他们所追求的是金钱。When they will come hasn't been made public.他们什么时候来还没有宣布。注意： what 引导主语从句时，主句谓语动词与表语保持数和意义上的一致，或是根据实际情况而定。如：What you left are only several old books.你留下的只是几本旧书。What you said is of great importance.你所说的很重要。What he has done move me a lot.他所做的事感动了我。二、由从属连词引导的主语从句that 引导主语从句时，本身无实际意义，只起连接作用，一般不可省略； if 和 whether 引导主语从句时意为“是否”，但if 引导的主语从句不可位于复合句句首。如：That he finished writing the composition in such a short timesurprised us all. 他在这么短的时间内就完成了这篇文章使得我们都很惊讶。Whether I'll attend the meeting hasn't been decided.＝ It hasn't been decided if I'll attend the meeting.我还未决定是否参加会议。三、 it 作形...