小学英语句型转换之肯定句变否定句学习教案

1、小学英语小学英语(yn y)句型转换之肯定句变否句型转换之肯定句变否定句定句第一页，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，提出一个观点或表陈述句：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！达自己心情的句子。特点是：句末都是句号，用降调读！第1页/共8页第二页，共8页。肯定句变否定句的方肯定句变否定句的方法法(fngf)1.含“be动词(dngc)

2、和情态动词(dngc)”型，直接在be动词(dngc)或情态动词(dngc)后加not,其它照抄不变。be动词(dngc)包括：am,is,are,was,were.常见的情态动词(dngc)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2页/共8页第三页，共8页。肯定句变否定句的方法肯定句变否定句的方法(fngf)注意注意(zh y)(zh

3、y)缩写：缩写： is not = isnt, are not = arent , is not = isnt, are not = arent , was not = wasnt, were not = werent, was not = wasnt, were not = werent, am not am not没有缩写，没有缩写， 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 = wo

4、nt could not = couldnt, will not = wont第3页/共8页第四页，共8页。肯定句变否定句的方法肯定句变否定句的方法(fngf)2.含“实意(shy)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(shy)动词前加助动词的否定dont,doesnt或didnt。“一还原”即把句中的实意(shy)动词变回原形。注意：在一般现在时中，当主语是第一(dy)、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 app

5、les.He likes apples.He doesnt like apples.She worked last night.She didnt work last night.第4页/共8页第五页，共8页。肯定句变否定句的方法肯定句变否定句的方法(fngf)要注意的特殊情况要注意的特殊情况(qngkung)(qngkung)：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 nevernever。例句(lj):1.There a

6、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.第5页/共8页第六页，共8页。相关(xinggun)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 Sha