九年级英语Unit13《Were-trying-to-save-the-earth!》知识点总结.docxVIP

九年级英语Unit13《Were trying to save the earth!》知识点 1.现在进行时定义：表示说话时（瞬间）正在进行的动作，也表示目前或现阶段一直进行的动作。结构: ① 肯定句: 主语 + am/is/are + V-ing?② 否定句: 主语 + am/is/are + not + V-ing?③ 疑问句: Am/Is/Are + 主语 + V-ing?用法：1）表示说话时正在进行的，目前正在发生的动作。① Look! The big bird is flying away. ② He is watching a movie now.?2）表示目前一段时间内正在进行，但说话时可能没有进行的动作。Right now I am studying Chinese by distance learning. 我现在正通过远程教育学习汉语。1) 2)常带有表示目前时刻的时间副词, 如：now, right now, at the (very) moment, for the time being, at present, these days 及Look! Listen! ...3）与always, constantly, forever, all the time等副词连用，表示动作反复或习惯。此时句子常含有说话者的强烈情感在内。表达较强的“责备”或“表扬”之意?① You are always changing your mind. 你总是主意不定。(太烦人了)?② He is always helping others.他总是帮助别人。(他真是个好人)?4）对于come, go, leave, arrive, start, fly, drive等表示位置移动的动词常可用进行时态表将来。① He is leaving on Wednesday.② Mary isn’t here at the moment. She is coming later.2. used to do过去常常做某事 见第四单元及use用法 be/get used to doing 习惯于做某事 be used to do=be used for doing 被用来做某事3. 被动语态 见第五单元注意：接双宾语的词的被动语态；make /let /have sb do的被动语态；see/ hear /notice /find /observe/notice sb do 的被动语态；It’s said/reported/believed/supposed/well-known that；及无被动语态的三种情况（感官动词、不及物动词、sell/write等）4. 现在完成时:?用法：①过去发生的动作对现在造成的影响或结果：强调结果Yesterday I finished my homework, that’s to say, I have finished my homework now.②过去已经开始一直持续到现在的动作或状态：强调继续I have lived here since 1990.现在完成时的构成 have/has+过去分词现在完成时的四个基本句型肯定句 He has finished the work.一般疑问句 Has he finished the work?否定句 He has not finished the work.两回答 Yes ,he has.? No, he hasn’t.特殊疑问句 What has he done?在下列情形下用现在完成时1九词语①already 已经 肯定句中或句尾 I have already found my pen. = I have found my pen already.②yet已经 否定句和疑问句句尾 I have not finished the work yet.Have you bought a computer yet?③ever曾经 句中 Have you ever seen pandas?④never从不 句中 I have never been to Beijing.⑤just刚刚 句中 I have just done my work.⑥before以前 句尾 I have never been there before.⑦so far到目前为止 So far he has learned 200 words.⑧how long多久 How long have you lived here?⑨how many times多少次 How many times has he been to Beijing?2两词组havehasgone to去了某地 例：He