should可表示惊讶because可放句首.docx

外教一对一 should可表示惊讶because可放句首?1. Why, you may wonder, should spiders be our friends? 2. Because they destroy so many insects, and insects include some of the greatest enemies of the human race. 3. Insects would make it impossible for us to live in the world; they would devour all our crops and kill our flocks and herds, if it were not for the protection we get from insect-eating animals. 4. We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders. 5. Moreover, unlike some of the other insect eaters, spiders never do the least harm to us or our belongings.词汇点睛：1. should 可表惊讶、意外等。Im surprised that a careful man like him should have made such a mistake.想不到像他那么谨慎的人居然犯那种错误。Its a pity that Teresa should have died so young.那么年轻就死了，真是太遗憾了。2. devourvor=eatcarnivore n. 食肉动物carnivorous a.食肉的granivorous a. 食谷物的herbivore n. 食草动物herbivorous a. 食草的insectivore n. 食虫动物insectivorous a. 食虫的omnivore n. 杂食动物omnivorous a. 杂食的;无所不读的3. 量词a flock of birds;a herd of cattle;a school of fish;a swarm of bees;a pack of dogs;a throng of people;a gang of terrorists (一伙);a brood of chicks (一窝);a drove of cattle (被驱赶的一群)课文分析：1. Why, you may wonder, should spiders be our friends?设问句引发思考Why does the idea of progress loom so large in the modern world? Surely because progress of a particular kind is actually taking place around us and is becoming more and more manifest.插入语English, I think, is important.2. Because they destroy so many insects, and insects include some of the greatest enemies of the human race.关于because可否放在句首：首先说，because从句是可以放在句首的。为什么呢?我们先看几组句子：He will come tomorrow.Tomorrow, he will come.He will come if you help him.If you help him, he will come.He will not come because he is busy.Because he is busy, he will not come.通过上面的第一组例子中的tomorrow，你是否已经看出，副词在句子中的位置?because从句属于副词从句，在句中作状语。而英语中的状语的位置比较多，可以放在句尾、句中和句首。所以，以because为代表的从属连词引导的从句，可以放在句首。但这并不是说because引导的从句可以单独使用：Because he is busy.这么写绝对是错的，因为它只是一个从句而已。3. Insects would make it impossible for us to live in the world; they would devour all our crops and kill our flocks and herds, if it were not for the protection we get from insect-eating animals.虚拟语气：若不是;要不是;若非If it were not for=but for;=without=were it not forIf it were not for oxygen and nitrogen in the air, no man could live on the earth.But for your advice, I should have failed.Without air, all living things would die.I should be lonely, were it not for the birds and the flowers.4. We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction ofthe number destroyed by spiders.非谓语动词：过去分词Those elected as committee members will attend the meeting.I heard the song sung several times last week.Praised by the neighbors, the boy became the pride of his parents.现在分词They went to the park, singing and talking.The problem being discussed is very important.Having been told many times, the boy made the same mistake.不定式To see is to believe.To develop our economy, the government adopted the policy