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1、英语句型转换之一——肯定句变否定句的技巧请同学们记住以下单词:1、be动词的五种形式:am,is,are,was,were;2、情态动词:can,could,may,might,must,shall,should,will,would,need,hadbetter3、助动词:have,has,had一、动词后直接加not原句中含有be动词(am,is,are,was,were)和情态动词(can,shall,will,may,should,would,might,hadbetter等)时,要在动词后直接加not。如:1.I
2、amateacher.→Iamnotateacher.2.LiLeicanswim.→LiLeicannot(can't)swim.3.Hewillgotothezooifitrainstomorrow.→Hewillnot(won't)gotothezooifitrainstomorrow.4.Wehavelearned3,000words.→Wehavenot(haven't)learned3,000words.二、原句中没有be动词,助动词或情态动词时,要在行为动词前加助动词(do,does,did)与否定副词not
3、的缩写形式。1.句中第一个动词是原形时,在其前加上don’t。如:Igetupatsixo'clockeveryday.→Idon'tgetupatsixo'clockeveryday.2.句中第一个动词是三单形式时,在其前加上doesn’t,原来的动词三单形式改为动词原形。如:MrWangworksinafactory.→MrWangdoesn'tworkinafactory.3.句中第一个动词是过去式时,在其前加上didn’t,原来的动词过去式改为动词原形。如:XiaLinvisitedourfriendslastni
4、ght.→XiaLindidn'tvisitourfriendslastnight.4三、肯定句变否定句的七点注意1.肯定句变否定句时,除将谓语变为否定式外,句中其他词语也可能随之改变,如将some改为any,too和also改为either,already改为yet,and改为or等。如:Therearesomebirdsinthetree.树上有些鸟。→Therearen’tanybirdsinthetree.树上没有鸟。Helikesthegirl,too.他也喜欢这个女孩。→Hedoesn’tlikethegirl
5、,either.他也不喜欢这个女孩。Wehavealreadyseenthefilm.我们已看过这部电影。→Wehavenotseenthefilmyet.我们没有看这部电影。Helikessinginganddancing.他喜欢唱歌和跳舞。→Hedoesn’tlikesingingordancing.他不喜欢唱歌和跳舞。2.复合句的肯定式变否定式a.在含有宾语从句的主从复合句中,当主句的主语是第一人称,谓语动词是think,believe,guess时,如果要否定后面的宾语从句,习惯上否定主句的谓语动词。如:Ithin
6、kheis13yearsold.→Idon'tthinkheis13yearsold.Ibelieveshewillcomeheresoon.→Idon’tbelieveshewillcomeheresoonb.其他一般将主句变为否定式。如:IwascookingwhenMumgothome.→IwasnotcookingwhenMumgothome.3.不变谓语动词而变其他词语a.肯定句中含有both,both…and时,变否定句时both→neither;both…and→neither…nor;all→none。如:
7、Bothofusarestudents.all→Neitherofusisastudent.IknowbothEnglishandChinese.→IknowneitherEnglishnorChinese.Allofthemlikebananas.→Noneofthemlike(s)bananas.b.肯定句中含有every-,some-4的合成词,变否定句时常改为含有no-的合成词。如:Everythingisready.→Nothingisready.Thereissomethingwrongwithmybike.→
8、Thereisnothingwrongwithmybike.c.肯定句中含有“形容词+enoughtodosth.”,变否定句时改为“too+形容词的反义词+todosth.”。如:Sheisoldenoughtogotoschool.→Sheistooyoungtogotoschool.d.肯定句中含