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英语 改为否定句的方法
在英语中经常需要改写句子,而将句子改为否定句是常考题型,下面是小编收集整理的一些英语改为否定句的方法,大家一起来看看吧!
1.有系动词be(am,is,are,was,were)的,在后面加not;
2.有情态动词can,may,must等的,在后面加not;
3.已经有了助动词的,在后面加not;
4.没有前面三种情况的,要用到助动词do,does,did加not,放在动词原形前面;
5.特别情况,有些句子本身有不定代词做主语或者宾语了的,可以把不定代词改为否定就可以。
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怎样改英语否定句
先来点简单的
如果句子中有be动词、情态动词和助动词时可以再be动词、情态动词和助动词后加not
例如:I am a teacher.→I am not a teacher.
She can help me.→She can't help me.
Yes,I do.→No,I don't.
如果句中谓语动词为行为动词时,要根据时态选用do的相应形式,把肯定句变为否定句。
例如:The little girl wants to go there.
→The little girl doesn't want to go there.
He did his work yesterday.→He didn't do his work yesterday.
再来点扩展的
如果是祈使句变否定句时,一般在句首加Don't,但Let us或Let's开头的祈使句在 Let us或 Let's后加not即可。
例如:Put them over there.→Don't put them over there.
Let us go home.→Let us not go home.
如果主从复合句中,主句是I think,I believe等结构,变否定句时,形式上否定主句,实际上否定从句。
例如:I think chickens can swim .我认为鸡会游泳。
→I don't think chickens can swim .我认为鸡不会游泳。
如果剧中有“had better +动词原形”,变否定句时为“had better not +动词原形”。
例如:You'd better go to school.→ You'd better not go to school.
动词不定式变否定式时,常在不定式to前加not。
例如:The teacher tells me to do it.→The teacher tells me not to do it.
如果句中有使役动词和感官动词(make,let,hear,see,watch等)后接省略to的不定式,此种不定式变否定句时只需在省略to的动词原形前加not。
例如:I saw her work.→I saw her not work.
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特殊形式的否定句
(1)肯定句含有every-的合成词时,变否定句时改为no-。
如:Everything is ready.→Nothing is ready.
(2)肯定句中含有always, usually和ever时,变否定句时改为never。
如:He is always late for school.→He is never late for school.
(3)肯定句含有many,much时,变否定句时分别改为few,little。
如:Many students know him.→Few students know him.
(4)肯定句中含有still时,变否定句时应改为no longer。
如:Tom is still in bed.→Tom is no longer in bed.
(5)肯定句含有both, both...and,all时,变否定句时应改为never,neither...nor,none。
如:Both of us are students.→Neither of us is a student.
(6)肯定句含有nearly, almost时,变否定句时应改为 hardly。
如:Lily nearly knows him .→Lily hardly knows him .
(7)肯定句含有“形容词+ enough”时,变为否定句时应改为“too +形容词的反义词”。
如:He is short enough to reachit.He is too tall to reach it.
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小学英语否定句方法
表示某一否定意思。句中一定有not。有三种可能:be动词(am、is、are、was、were)+not、情态动词(can、must、should)+ not、助动词(do、does、did) + not-------如何将一个肯定的陈述句改为否定句:
1.看句中有无be动词
如有,直接在be动词后+ not。
2.看句中有无情态动词
如有,直接在情态动词后+ not
3.如上述二者都没有,就应用助动词+ not
分四个步骤:
(1)肯定陈述句中本来是没有助动词的,要加上去,位置在主语(某人或某物)后,动词前。
(2)确定助动词用do、does还是did,根据句中动词,动词是原形的助动词就用do,动词是第三人称单数的助动词就用does,动词用过去式的助动词就有did。
(3)在助动词后加not。
(4)原句中动词假如发生变化就要恢复成原形。
强调一点,有some的要考虑是否要用any。