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ID:50650546
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时间:2020-03-14
《小学英语句型转换之肯定句变否定句ppt课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、小学英语句型转换——肯定句变否定句1一、概念:什么是肯定句和否定句?{肯定形式→肯定句否定形式→否定句陈述句陈述句:说明一件事情、一个想法,提出一个观点或表达自己心情的句子。特点是:句末都是句号,用降调读!2肯定句变否定句的方法1.含“be动词和情态动词”型,直接在be动词或情态动词后加not,其它照抄不变。be动词包括:am,is,are,was,were.常见的情态动词有:can,could,would,will,may等等。例句:Iamastudent.→Iamnotastudent.→→Heisaboy.Heisnot/isn'tab
2、oy.IcanspeakEnglish.Icannot/can'tspeakEnglish.3肯定句变否定句的方法注意缩写:isnot=isn't,arenot=aren't,wasnot=wasn't,werenot=weren't,amnot没有缩写,但是Iam=I'mcannot=can't,wouldnot=wouldn'tcouldnot=couldn't,willnot=won't4肯定句变否定句的方法2.含“实意动词”型,转换否定句时,记住五个字“一加一还原”的原则。“一加”即在实意动词前加助动词的否定don't,doesn't
3、或didn't。“一还原”即把句中的实意动词变回原形。注意:在一般现在时中,当主语是第一、二人称或复数时,加don't来否定;当主语是第三人称或单数时,加doesn't来否定;在一般过去时中,一律用didn't来否定。例句:Ilikeapples.→→→Idon'tlikeapples.Helikesapples.Hedoesn'tlikeapples.Sheworkedlastnight.Shedidn'tworklastnight.5肯定句变否定句的方法要注意的特殊情况:遇到some变any;遇到too/also变either;遇到and
4、变or;遇到always变never。例句:1.Therearesomeboysintheclassroom.Therearen'tanyboysintheclassroom.2.Thegirlcansinganddance.Thegirlcan'tsingordance.6相关练习:1.Mikewouldlikesomechicken.→Mike______like______chicken.2.Heoftengoestobedatten.→Heoften___________tobedatten.3.Maryisateacher,too.
5、→Mary______ateacher,_______.4.TheywenttoShanghaiyesterday.→They___________toShanghaiyesterday.wouldn'tanydoesn'tisn'teitherdidn'tgogo肯定句变否定句7Thankyou8
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