UnitComputers 语法PPT课件

1、现在完成时1.现在完成时的结构： He has finished his homework already.否定He has not finished his homework yet.一般疑问Has he finished his homework already?肯定回答Yes,he has. 否定回答No,he hasnt.特殊疑问句What has he done already?have / has + 动词的过去分词（v-ed）_()否定疑问都是在has 或 have 上变化。第1页/共18页 I have been a student since two years ago.否定

2、句一般疑问句肯定回答：Yes, I have. 否定回答：No, I havent.be-(am is are)-(was were)-beenI havent been a student since two years ago.Have you been a student since two years ago?原形一般现在式一般过去式过去分词第2页/共18页练习,用have或has的正确形式填空1.I _ lived in Beijing for ten years.2.He _ studied here since two years ago.3.They _ finished th

3、eir work already.4.In the past five years, Tom _ worked as a worker.5._ you ever been to Beijing.6.She _ not finished her homework yet.havehashavehasHavehas主语是第三人称单数用has，其他人称用have。第3页/共18页1.I _(live) in Beijing for ten years.2.He _(study) here since two years ago.3.They _(finish) their work already.

4、4.In the past five years, Tom _(work) as a worker.5._ you ever _(be) to Beijing.6.She _ her homework yet.have livedhas studiedhave finishedhas workedHave beenhasnt finished第4页/共18页被动语态1.被动语态的结构主动语态：I finish my homework.被动语态My homework is finished by me. be + 动词的过去分词（v-ed）_be动词的过去分词notdont第5页/共18页练习：

5、用be的正确形式填空1. the apple _ eaten by Tom.2.Many apples _ eaten by Tom.3.The apple _ eaten by Tom yesterday.4.Many apples _ eaten by Tom yesterday.5.The apple will _ eaten by Tom tomorrow.6.Many apples will _ eaten by Tom tomorrow7.The apple has _ eaten by Tom already.8.Many apples have _ eaten by Tom a

6、lready.eat-ate-eatenisarewaswerebebebeenbeen第6页/共18页现在完成时的被动语态现在完成时：have / has +动词的过去分词（v-ed）被动语态：be + 动词的过去分词（v-ed）现在完成时的被动语态have/has + been + 动词的过去分词第7页/共18页研究下面的句子，把用到被动语态的地方画出来1.Over time I have been changed quite a lot.2.First as a PC and then as a laptop,I have been used in offices and homes s

7、ince the 1970s.3.Since the 1970s many new applications have been found for me.4.I have also been put into robots and used to make mobile phones as well as help with medical operations.5.I have even been put into space rockets and sent to explore the Moon and Mars.第8页/共18页研究下面的句子，把用到被动语态的地方画出来1.Over

8、time I have been changed quite a lot.2.First as a PC and then as a laptop,I have been used in offices and homes since the 1970s.3.Since the 1970s many new applications have been found for me.4.I have also been put into robots and used to make mobile phones as well as help with medical operations.5.I

9、 have even been put into space rockets and sent to explore the Moon and Mars.现在完成时的被动语态第9页/共18页被动语态练习：主：Snow has covered the ground for weeks.被：The ground _ _ _by snow.主：You have finished this work since two days ago.被：This work _ _ _ since two days ago.主：They have sold ten houses in the past one ho

10、ur被：Ten houses _ _ _ in the past one hour.has been coveredhas been finishedhave been sold第10页/共18页现在完成时被动语态的练习1.-The window is dirty. - I know. It _ for ten days. A.hasnt cleaned B.didnt clean C.wasnt cleaned D.hasnt been cleanedDD2.Though we dont know what was discussed, yet we can feel the topic _

11、. (讨论)A. had changed B. will changeC. was changed D. has been changed第11页/共18页现在完成时的被动语态主语+have / has + 动词的过去分词（v-ed）主语已经被.1.课本P100页，背诵从arise到bring的变化形式。2.名校学案，P32（第1,4,5,7,9）第12页/共18页示意某人用这种方法鼓励某人做.与.对抗决定做.在.帮助下在某种程度上what . do with = How. deal with第13页/共18页look at:看. watch for:留意. watch over:看管 look for:寻找.in a way:在某种程度上 on the way:在路上 by the way:顺便说一下 in the way:挡路，妨碍第14页/共18页signal : 信号 chance : 机会 mark : 标记 measure :措施 let / make sb do sth. 让某人做. signal sb to do sth. 示意某人做. call sb to do sth. 叫某人做某事第15页/共18页anyhow : 无论如何 however: 尽管如此 Thu