搜索
小学英语句型转换——肯定句变否定句一、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！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'taboy.IcanspeakEnglish.Icannot/can'tspeakEnglish.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't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.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变or;遇到always变never。例句:1.Therearesomeboysintheclassroom.Therearen'tanyboysintheclassroom.2.Thegirlcansinganddance.Thegirlcan'tsingordance.相关练习：1.Mikewouldlikesomechicken.→Mike______like______chicken.2.Heoftengoestobedatten.→Heoften___________tobedatten.3.Maryisateacher,too.→Mary______ateacher,_______.4.TheywenttoShanghaiyesterday.→They___________toShanghaiyesterday.wouldn'tanydoesn'tisn'teitherdidn'tgogo肯定句变否定句