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1、小学英语句型转换肯定句变否定句一、概念：一、概念：什么是肯定句和否定句？什么是肯定句和否定句？肯定形式肯定形式肯定句肯定句否定形式否定形式否定句否定句陈述句陈述句陈述句：说明一件事情、一个想法，提出一个陈述句：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！是句号，用降调读！肯定句变否定句的方法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
2、等。例句：I am a student. I am not a student.He is a boy.He is not/isnt a boy.I can speak English.I can not/cant speak English.肯定句变否定句的方法肯定句变否定句的方法注意缩写：注意缩写： is not = is not = isntisnt, are not =, are not = arentarent , , was not = was not = wasntwasnt, were not = , were not = werentwerent, , am not am n
3、ot没有缩写，没有缩写， 但是但是I am = I am = ImIm can not = can not = cantcant, would not = , would not = wouldntwouldnt could not = could not = couldntcouldnt, will not = , will not = wontwont肯定句变否定句的方法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dont,doesnt或didnt。“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
4、主语是第一、二人称或复数时，加dont来否定；当主语是第三人称或单数时，加doesnt来否定； 在一般过去时中，一律用didnt来否定。例句：I like apples.I dont like apples.He likes apples.He doesnt like apples.She worked last night.She didnt work last night.肯定句变否定句的方法肯定句变否定句的方法要注意的特殊情况要注意的特殊情况：遇到some 变 any; 遇到too/also变either;遇到and 变 or; 遇到always 变 never。例句:1.There a
5、re some boys in the classroom.There arent any boys in the classroom. 2.The girl can sing and dance.The girl cant sing or dance.相关练习：1.Mike would like some chicken. Mike_like _ chicken.2.He often goes to bed at ten. He often _ _ to bed at ten.3.Mary is a teacher,too. Mary _ a teacher ,_.4.They went to Shanghai yesterday. They _ _to Shanghai yesterday.wouldntanydoesnt isnteitherdidnt gogo肯肯定句定句变否定句变否定句