人教版必修五Unit 1 Great Scientists language points学案（五）.docx

unit 1 great scientists language points学案（5）重点句式1. with+宾语+宾补 he placed a fixed sun at the centre of the solar system with the planets going round it and only the moon still going round the earth. 他把太阳固定在太阳系的中心位置，而行星绕着太阳转，只有月球仍然绕着地球转。(教材p7)【句子分析】he placed a fixed sun at the centre of the solar system (with the planets going round it only the moon still going round the earth). with宾语宾补结构，宾补为现在分词短语【重点语法】with复合结构由with宾语宾补组成，常在句中作状语，表示伴随情况、时间、原因、方式等，也可作定语。其构成有下列几种情形：with名词(或代词)现在分词/过去分词/形容词/介词短语/副词/动词不定式with prices going up so fast, we cant afford luxuries. 由于物价上涨很快，我们买不起奢侈品。(原因状语)i like to sleep with the windows open. 我喜欢睡觉时开着窗户。(伴随状语)the soldier had him stand with his back to his father. 那个士兵让他背对着他父亲站着。(方式状语)【跟踪典例】用所给词的适当形式完成句子1. with our homework _, we went to play football.(finish)2. the children came running towards us with some flowers_.(hand)3. with a lot of work _, i wont be able to go on holiday.(do)【答案】1. finished 2. in their hands 3. to do2. only if+情态动词/be动词/助动词+主语+其他成分 only if you put the sun there did the movements of the other planets in the sky make sense.只有当你把太阳放在中心位置上，天空中其他行星的运动才能讲得通。(教材p7)【句式分析】 you put the sun there the movements of the other planets in the sky .【重点句型】only if+情态动词/be动词/助动词+主语+其他成分。1. only if 意为只有，引导条件状语从句，放在句首或主句后均可，放在句首时主句要部分倒装。2-1-c-n-j-yonly if you work hard can you stand out.你只有努力工作才能出人头地。i wake up only if the school bell rings.只有学校的铃响了，我才会醒。2. only修饰状语或状语从句时，从句不倒装而主句倒装。only in paris do you find bars like this.只有在巴黎，你才会发现像这样的酒吧。only when he is seriously ill does he ever stay in bed.只有病得很重时，他才卧床休息。21*cnjy*com【易混辨析】 only if与if only易混词组辨析例句ony if只要，只有，通常引导陈述语气的真实条件句，是必要条件only if you study hard will you pass the exam. 只有努力学习，你才会通过考试。if only但愿，要是就好了，常引导虚拟语气的条件句，引出感叹句if only he hadnt driven so fast! 要是他驾驶得没有那么快就好了！only+副词/介词短语/状语从句位于句首时，句子或主句需用部分倒装语序，但only若修饰主语则不用倒装。only you can help me.只有你能帮我。【跟踪典例】完成句子1. 只有这样你才能学好英语。only in this way_ english well.【来源：21世纪教育网】2. 只有我们齐心协力，我们才能成功。_ we pull together can we achieve succe