现在进行时和过去进行时

现在进行时与过去进行时,八、动词时态,现在进行时：表示现在正在进行的动作或状态。构成：肯定式：be(am,is,are)+doing否定式:am/is/arenot+doing疑问式:Is/Are+主语+doing?标志词:now,look,listen,ateightEg:Look!Tomisplayingchesswithhisgrandfather.Itseightnow.WearehavinganEnglishlesson.,一、将下列句子改为否定、疑问句并回答。1.Imwritingalettertomyfriendnow.否：_writingalettertomyfriendnow.问：_writingalettertomyfriendnow?Yes,_.No,_.2.Theyarecleaningtheclassroom.否:They_theclassroom.问:_they_theclassroom?Yes,_.No,_.二、用所给单词的正确形式填空。1.What_you_(do)now?I_(swim).2._yourfather_(read)anewspapernow?Yes,he_.No,he_3.Look!Who_(give)atalk4.Listen!MikeandKate_(sing)5.He_(read)now.He_(notwrite),Whataretheydoingnow?Theyareplayingfootball.Whatweretheydoingyesterday?Theywereplayingfootball.,Whataretheydoing?Theyarerunning,Heisplayingtheguitar.,Theyaredancing.,Heisswimming.Isheswimming?Yes,heis./No,heisnt.,过去进行时怎么说?,现在进行时由am/is/are+doing构成.想一想,过去进行时的构成是怎样?was/were+doing请看下面的句子：Iwasplayingbasketball.Iwasnotplayingbasketball.Wereyouplayingbasketball?Yes,Iwas./No,Iwasnot.想一想,把I改成He/They要怎样说呢?,过去进行时的否定式:was/werenot+doing过去进行时的疑问式:Was/Were+主语+doing?标志词:then,atthat/thistime,ateightyesterday,WhenIcamein,amomentagoEg:1.Myfatherwasreadingnewspaperatnineyesterday.2.LiLeiwastalkingwhentheteachercamein.主句(过去进行)从句(过去时)3.WhileLiLeiwastalking,theteachercamein.从句(过去进行)主句(过去时)IwaslisteningtothemusicwhileIwasdoingmyhomework,It_(rain)whenIwentoutyesterday.Myfather_(play)abasketballmatchatninelastnight.3.They_(practice)singingatthattime4.Whilehe_(read),he_(listen)tothemusicyesterday.5.Hesaidhe_(clean)therooma