八年级下英语第4单元单词解析讲义ppt课件.ppt
单词讲解,allow,allow sb to do sth 允许某人做某事sb be allowed to do sth 某人被允许做某事allow doing sth 允许做某事allow sb in/out 允许某人进入/出去Teenagers shouldnt be allowed to smoke.不应该允许青少年吸烟。辨析 let sb do sth 语气较弱，不能用于被动语态,guess,1 v.Can you guess how old he is?2 n.If you dont know the answer,have a guess!可数名词，猜想，猜测主句含有:I/We guess/think/believe/suppose+从句时，要进行否定前移 I guess he can swim.I dont guess he can swim.I guess he can swim,cant he?,deal,1 协议；交易 I did a deal with my parents on housework.在家务上我与父母达成一项协议。2 big deal 重要的事3 处理，deal with,与疑问词how 连用 How will you deal with the homework?,communication,1 communicate with sb 与某人交流、沟通、联络 2 communicate to sb 向某人报告、通知、传达 For better communication,I also communicate with him by phone.为了更好地沟通，我还和他电话交流。,argue,1通常与介词about 和with 连用,不及物动词 argue with sb about sth 为某事与某人争辩have an argument with sb I had an argument with him.,cloud,Look at those dark clouds.Its going to rain.看那些乌云，要下雨了。cloud,（像云的）尘土或烟雾 clouds of smoke 一团团的烟 cloudy 多云的 a cloudy sky,older/elder,1 older,指年龄较大、较老，也指较旧 Tom is two years older than John.This book is older than that one.2 elder,年长的，只用做定语，不用作表语 He is my elder sister.We should respect our elders.我们应该尊重长辈。,instead,1 instead 为副词，常放在句首或句尾 I will go instead.2 instead of 为介词短语，后面接名词、代词，介词短语或动名词形式 She wrote to him instead of calling him.=She didnt call him.She wrote to him instead.,nervous,比较级：more nervous 最高级：most nervousbe nervous of/about 对感到紧张 They are nervous of/about their test.,offer,1.offer sb sth/offer sth to sb向某人提供某物 注：可以接受，也可以不接受2.offer to do sth 提议去做某事 I offered her a book.我给了她一本书。He offered to help me.他向我提供帮助。辨析：provide强调为应付意外、突发事件、紧急情况等做好充足准备而“提供，供给”，多数情况是免费的。provide sb with sth 为某人提供某物 provide sth for sb,proper/explain,He never explains anything properly.他从来不好好解释任何事情。explain oneself 解释，交代清楚explain sth to sb 向某人解释某事Alice usually explains the new words to us.explanation n.解释，说明,clear,1.清楚易懂的；晴朗的 She spoke in a loud clear voice.她说话声音既洪亮又清楚。2.清澈的；透明的 clear water 清澈的水；clear glass 透明的玻璃3.clearly 清楚地，明白地辨析：clean 干净的；清洁的；而clear表清澈 clean water 干净的水（强调没有尘污）clear water 清澈的水（强调清澈、透明）,return,1.return=come back/go back return to=go back to=come back to 2.return,归还；还给 return sth to sb/return sb sth 归还某人某物 Please return the money to her.注：是非延续动词，不可以与表示一段时间的状语连用。,compete,competition 竞赛，比赛competitor 参赛选手enter a competition 参加比赛 compete with sb against for Teams from many countries compete in the World Cup.很多国家的球队参加世界杯比赛。,opinion,1.同义词：idea;thought;view Whats your opinion of my work?对我的工作您有什么意见？2.in ones opinion=I think 在某人看来 In my opinion,you are right.我认为你是对的。insist on ones opinion 坚持某人的观点,skill,技艺，技巧 It needs a great skill to fly a plane.开飞机需要很高的技巧。skillful 孰练的 扩展：Practice makes perfect.Skill comes from practice.,quick,1 Have a quick look.He took out his book quickly.辨析：fast:形容词/副词，强调动作速度之快。quick:形容词，着重动作迅速发生或完成 即刻行动，豪不耽误soon:强调时间，很快；马上，即不久以后将发生的某个动作或某种情况。Ill write to you as soon as possible.,continue,1持续，继续存在，接名词、动名词、不定式或名词性从句做宾语 How far does the road continue?这条路有多长？continue doing sth 继续做原来的事=go on doing sth continue to do sth 继续做某事（另一件事）After finishing Unit 3,lets continue to learn Unit 4.辨析：continue;go on;last,continue 指进程在时间或空间上的延续，有时也可指短暂停止后继续进行。He continued the work for three hours.go on：go on to do sth=continue to do sth go on doing sth=continue doing sthlast:说明某一动作要延续一段时间。She wont last long in that job.那份工作她做不了多久。,compare,1 compare with将与比较 compareto 把比作 Dont compare yourself with others.不要与别人比较。Children are compared to national flowers.,crazy,1 不理智的，疯狂的 You must be crazy to walk at night with no lights.2 热衷的，狂热的 She is crazy about pop music.3 crazily adv.疯狂地，热衷地,cause,Smoking can cause lung cancer.吸烟能导致肺癌。What was the cause of the accident?You have no cause to complain.辨析：cause:引起某种结果的原因，后接of reason:指决定做某事或采取某项行动的理由。excuse:辩解，借口,perhaps,maybe=perhaps,位于句首或句末 Maybe/Perhaps it will rain tomorrow.probably 可能性大于maybe/perhaps.He will probably come tomorrow.possibly 较probably 可能性小 在肯定句里可能性很小，在否定、疑问句中与can/could 连用，表示“无论如何不”。Could he possibly agree?他难道会同意吗？,人有了知识，就会具备各种分析能力，明辨是非的能力。所以我们要勤恳读书，广泛阅读，古人说“书中自有黄金屋。”通过阅读科技书籍，我们能丰富知识，培养逻辑思维能力；通过阅读文学作品，我们能提高文学鉴赏水平，培养文学情趣；通过阅读报刊，我们能增长见识，扩大自己的知识面。有许多书籍还能培养我们的道德情操，给我们巨大的精神力量，鼓舞我们前进。,
