be动词-情态动词及助动词用法

七年级英语双休日作业班级：姓名：等级英语句型变化总结练习1、含有be动词am，is，are构成的句子：变一般疑问句时把am，is，are提到句子的前面，句尾用问号即可。变否定句时直接在am，is，are后面加not即可。例如：肯定句:Heisastudent.一般疑问句:astudent?否定句:Heastudent.肯定句：WearefromChina.一般疑问句:fromChina?否定句：WefromChina2.由情态动词can,may,should等构成的句子:变一般疑问句时把can,may,提到句子的前面,句尾用问号即可.变否定句时直接在can,may,后面加not即可.例如:肯定句:Shecanswim.一般疑问句:sheswim?否定句:Sheswim.3.由行为动词构成的句子:需要加助词do或does.变一般疑问句时把do/does放在句子前面.变否定句时在主语后面加don’t/doesn’t,谓语用动词原形。例如:肯定句:Theyplayfootballafterschool.一般疑问句:playfootballafterschool?否定句:Theyfootballafterschool.肯定句：TomwatchesTVeveryday.一般疑问句:TomTVeveryday?否定句:TomTVeveryday.注意：变否定句时相关词的改变肯定句变否定句时，除将谓语变为否定式外，句中其他词语也可能随之改变：如将some改为any，too和also改为either，and改为or等：Therearesomebirdsinthetree.树上有些鸟。→Therearen’t______birdsinthetree.树上没有鸟。Helikesthebook,too.他也喜欢这本书。→Hedoesn’tlikethebook,______.他也不喜欢这本书。Helikessinginganddancing.他喜欢唱歌和跳舞。→Hedoesn’tlikesinging______dancing.他不喜欢唱歌也不喜欢跳舞。补充练习：根据句后括号内的要求，填入句中所缺的词：1.Iknowtheanswer.(一般疑问句)____________knowtheanswer?2.Wecanseesomebirds.(一般疑问句)____________see______birds?3.Thereisacomputerinthehouse.(一般疑问句)____________acomputerinthehouse?4.Therearesomeflowersontheteachers’desk.(一般疑问句)____________anyflowersontheteachers’desk?5.Therearesomeapplesonthetree.(否定式)There__________________applesonthetree.6.Ithinkheisold.(否定句)I______thinkhe______old.7.Openthewindow.(否定句)______openthewindow.8.WecanspeakgoodEnglish.(变否定句)We____________speakgoodEnglish.9.Thankyouforhelpingme.(同义句)Thankyoufor____________.10.Whoseisthisbook?(同义句)____________isthis?11.Thisisherbook.(同义句)Thisbook____________.12.Hersweaterisred.(对划线部分提问)____________ishersweater?13.Mypencilsareinthepencil-box.(对划线部分提问)____________yourpencils?14.Igetupatsixeveryday.(对划线部分提问)____________doyougetupeveryday?15.Therearefiftystudentsinmyclass.(对划线部分提问)____________studentsarethereinyourclass?16.Thesearecars.(用buses改写成选择疑问句)Arethesecars____________?17.Thebookisinmyschoolbag.(变疑问句)______thebookinyourschool-bag?18.Twoboysareinourhouse.(改为therebe句型)____________twoboysinourhouse.19.Canyoufindthekey?(作肯定回答)______,I______.20.It’sMondaytoday.(对划线部分提问)____________isittoday?