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1、小学英语(yn y)句型转换肯定句变否定句第一页，共8页。一、概念一、概念(ginin)：什么是肯定句和否定句：什么是肯定句和否定句？肯定肯定(kndng)形式形式肯定肯定(kndng)句句否定否定(fudng)形式形式否定否定(fudng)句句陈述句陈述句陈述句：说明一件事情、一个想法，提出一个观陈述句：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：句末都是句点或表达自己心情的句子。特点是：句末都是句号，用降调读！号，用降调读！第二页，共8页。肯定句变否定句的方法肯定句变否定句的方法(fngf)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(qt
2、)照抄不变。be动词包括：am,is,are,was,were.常见的情态(qngti)动词有：can,could,would,will,may等等。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.第三页，共8页。肯定句变否定句的方法肯定句变否定句的方法(fngf)注意缩写：注意缩写： is not = isnt, are not = arent , is not = isnt, are not = ar
3、ent , was not = wasnt, were not = werent, was not = wasnt, were not = werent, am not am not没有没有(mi yu)(mi yu)缩写，缩写， 但是但是I am = ImI am = Im can not = cant, would not = wouldnt can not = cant, would not = wouldnt could not = couldnt, will not = wont could not = couldnt, will not = wont第四页，共8页。肯定句变否定句的
4、方法肯定句变否定句的方法(fngf)2.含“实意动词”型，转换否定句时，记住(j zh)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(d sn rn chn)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 nigh
5、t.She didnt work last night.第五页，共8页。肯定句变否定句的方法肯定句变否定句的方法(fngf)要注意的特殊要注意的特殊(tsh)(tsh)情况：情况：遇到遇到some some 变变 any; any; 遇到遇到too/alsotoo/also变变either;either;遇到遇到and and 变变 or; or; 遇到遇到always always 变变 never never。例句(lj):1.There are some boys in the classroom.There arent any boys in the classroom. 2.The
6、girl can sing and dance.The girl cant sing or dance.第六页，共8页。相关(xinggun)练习：1.Mike would like some chicken. Mike_like _ chicken.2.Heoftengoestobedatten. 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第七页，共8页。Thank youThank you 第八页，共8页。
