UnitComputers语法学习教程.pptx
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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页第一页,编辑于星期日:二点 二十六分。I have been a student since two
2、years ago.否定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页第二页,编辑于星期日:二点 二十六分。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 ye
3、ars ago.3.They _ finished their 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页第三页,编辑于星期日:二点 二十六分。1.I _(live)in Beijing for ten years.2.He _(study)here since two ye
4、ars ago.3.They _(finish)their work already.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页第四页,编辑于星期日:二点 二十六分。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 fin
5、ished 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页第五页,编辑于星期日:二点 二十六分。练习: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 tomorrow
6、7.The apple has _ eaten by Tom already.8.Many apples have _ eaten by Tom already.eat-ate-eatenisarewaswerebebebeenbeen第6页/共18页第六页,编辑于星期日:二点 二十六分。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页第七页,编辑于星期日:二点 二十六分。研究下面的句子,把用到被动语态的地方画出来1.Over time I hav
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