小学英语句型转换之肯定句变否定句演示教学.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,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：,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,注意缩写：,is not=,isnt,are not=,arent,was not=,wasnt,were not=,werent,am not,没有缩写，但是,I am=,Im,can not=,cant,would not=,wouldnt,could not=,couldnt,will not=,wont,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,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 are,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.,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.,wouldnt,any,doesnt,isnt,either,didnt,go,go,肯,定句,变否定句,Thank you,