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Ridebikesisgoodforhealth.Ridebikesisgoodforhealthy.Ridingbikeskeepshealth.Ridingbikekeepshealthy.Spendmoneyonhimselfmeansverylittletohim.Sittingdown,please.Playbasketballisasport.Danceandplayviolinismyhobby（爱好）.TorFV原形能做主语。V原形不能做主语。V-ing能做主语。V-ing不能做主语。单个V-ing做主语时，谓语动词用________数,即动词后加_______，若是系动词，应该用_________(一般现在时)，_________(一般过去时).两个或两个以上V-ing做主语时，谓语动词用________数，若是系动词，应该用_________(一般现在时)，_________(一般过去时).V-ing做主语有两种情况。1.直接做主语。___________________.(学无止境)2.用it做形式主语，真正的主语——V-ing放在后面。常用句式：Itisnouse/nogood/awasteoftime+V-ing干什么是没用的/浪费时间1.担心犯错误是不对的。2.不要担心犯错误是很重要的。3.在课堂说话是浪费时间。4.和她争辩是没用的。（两种表达）V-ing否定：notdoing1.收到你的来信使我不开心。Receivingyourlettermakesmeunhappy.2.没有收到你的来信使我不开心。Notreceivingyourlettermakesmeunhappy.三、第10小题不同的时态的被动：一般现在时is/am/aredone一般过去时was/weredone一般将来时willbedone/begoingtobedone将被...正在进行时is/am/arebeingdone正在被...过去进行时was/werebeingdone正在被...现在完成时have/hasbeendone已经被...过去完成时hadbeendone一般情况下，被动的结构：bedoneHeispraisedbytheteacher.Hewaspraisedjustnow.Hewillbepraisedtomorrow.Heisbeingpraisedbytheteachernow.Hewasbeingpraisedbytheteacher.Hehasbeenpraised.Hehadbeenpraisedbeforeheleft.一般情况下，被动的结构：bedoneV-ing的被动结构：BeingdoneV-ing结构可以做主语，那么V-ing的被动也可以做主语吗？Praisingthestudentsmakesmehappy.(主动)Beingpraisedbytheteachermakesmehappy.（被动的含义）如果需要用V或动V短语做主语，我们需要在V后面加____,即表主动直接用V-ing,否定为NotV-ing，V-ing做主语表被动用beingdong,否定为Notbeingdone.Attention:bebeingdone表示进行时态的被动，意思是“正在被...”不能做主语。它构成的主系表结构。V-ing可以做主语。否定结构为not+V-ingV-ing的被动也可以做主语，结构：beingdone否定结构为not+beingdonebebeingdone是_____________时态的____________语态，不能做主语,做主语的时候要去掉__________。Thisproblemisbeingdiscussedrightnow.PraisingthestudentsmakesourEnglishteacherhappy.Beingpraisedbytheheadteachermakesmesurprised.Heenjoysbeingpraisedbytheschoolmaster.1.这个问题正在被我们讨论。(discuss)2.表扬学生使我们英语老师很开心。3.被班主任表扬让我非常吃惊。（headteacher）4.他喜欢被校长表扬。(schoolmaster)他喜欢被校长表扬。Heenjoys____________bytheschoolmaster.V-ing不仅可以做主语，也可以做_______语,若是被动，结构也是_________.enjoy/finish/bear(忍受)/mind/practise/suggest/consider/admit(承认)/avoid(避免）/imagine(想象)/can'thelp(情不自禁)+doing被动用：beingdonebeingpraised宾beingdonemeantodomeandoingtrytodosthstoptodotrydoingstopdoingremembertodoforgettodoremeberdoingforgetdoingregrettodo后悔要去做什么regretdoing后悔做了什么