U2t2仁爱英语九年级上知识详解2015最新版.doc

1. A lot of rich land has changed into desert. change sth. into sth. 把。变成。 e,g. Water has changed into steam.水变成了蒸汽。2. Trees can stop the wind from blowing the earth away. a.stop/prevent sb./sth.(from)doing sth.阻止某人/某物做某事。From可以省略。 e.g. The heavy snow stopped/prevented the visitors(from)leaving the top of the mountain.大雪使游人不得不停留在山顶上。 b,earth着重指与天空相对的“土地”，还泛着泥土； soil主要指用于种植庄稼的“土壤”： ground主要指大地表面： land着重指河，湖，海洋相对的陆地。 e,g, Put the tree in the hole and fill it with _ again.把树放进坑里，然后用土重新将坑填满。 Light,water, air and _ are essential to plant life. 日光，水分，空气和土壤对植物生长是不可缺少的。 The bag fell on the _.那个包掉到地上了。 A lot of good _has gone,大片的良田消失了。3. Cutting down trees is harmful to human beings, animals and plants. a.cut down砍倒。注意：cut的现在分别词为cutting,过去式和过去分词均为cut. e,g,Dont cut down any trees.4. Although we have built “The Green Great Wall” although conj.意为“虽然，尽管”，引导让步状语从.在句子中使用although或though时，不能同时使用but，但although/though后可用yet或still等。e,g,Although the question is difficult,he can still answer it.尽管这个问题很难，他仍能回答上来。加强语气时，通常说even though,而不说even although.5 People have cut down such a large number of trees that the land changed into desert. a number of许多，大量，修饰可数名词复数。修饰主语时，谓语用复数形式。 the number of的数量，修饰可数名词的复数。作主语时，谓语动词用单数形式。Eg._ number of students in our class is50. _ number of students are planting trees on the hill.a lot of=lots of许多，大量，即可修饰可数名词又可修饰不可数名词。plenty of 大量，众多，充足，即可修饰可数名词又可修饰不可数名词。 6. come into being开始存在，产生，诞生 e,g,The first computer came into being in 1946.第一台电脑诞生于1946年。7. die out灭绝，消失e,g, We must try our best to protect the wild animals,or they will die out.我们必须尽力保护野生动物，否则他们会灭迹。8 As a result, air pollute has become a serious problem. as a result结果。As a result of由于。 e,g.As a result,we were all lats for class。9. But the government is doing something useful to protect the environment. something useful 形容词修饰不定代词时，要放在所修饰词的后面，作后置定语。Somewhere warm暖和的地方，nothing serious没什么严重的。 e,g, There is something interesting in todays newspaper.今天胡报纸上有一些有趣的事。10. None of us likes pollution. none指三者或三者以上胡“没有，都不”。即可指“人”也可指“物”，常与of连用。即可修饰可数名词，也可修饰不可数名词。构成“none of+名词/代词”结构，当名词是不可数名词时，谓语动词用第三人称单位，当名词胡复数时，谓语动词用单复数均可。 e,g,None of those buses go(es)there.没有一辆公共汽车去那里。 若要表示二者“都不”，应该用neither.回答以how many/much引导的特殊疑问句表示否定时用no one.11. We shouldnt leave rubbish here and there. here and there处处，到处。与everywhere同义。 e,g.Ive looked for my key here and there(everywhere),but I cant find it. everyone表示“每个人”，只指人，不指物，不接of短语，它强调整体，如果后接表范围的of短语，则写成every one. e,g, He knows everyone in our class.他认识我们班里的每一个人。12. We should do everything we can to protect the environment.此句中 we can作everything的定语，省略了引导词that及从句中胡谓语do,意为“一切能做的事情”。13. Some things we have done are very good for the earth while others are bad. a. we have done .前省略了that, 作定语从句，修饰前面的some things. b.be good for对。有益：be good at. Eg. Doing morning exercises is _ _our health. Kangkang is _ _swimming. C.while而，然而，相当于but,表示对比。14. This is called “the greenhouse effect”. It causes the level of the oceans to rise and the climate of the earth to change. Rise v.升起，上涨，上升。使升高，举起。 Eg. The sun rises in the east.15. The sea seems to have the best answer. Seem v. 似乎是，近义词appear 结构 seem to be+表语 It seems that+从句 Seem to do sth eg.He _quite happy. _that I have seen him somewhere before. He _enjoy himself.16. How can we avoid a serious water shortage? Avoid +ving/n Try to avoid_(speak)loudly in the office.17. But peoples ne