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你好：否定句：一般情况下，在be、have 、情态动词上加上not例如：She is a teacher.She isn't a teacher.若没有这些动词，则加上助动词。I like swimming.I don't like swimming.一般疑问句：把动词提前（be、have、情态）She is a teacher.Is she a teacher?若没有这些动词，在句子前加上助动词。I like swimming.Do you like swimming?
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动词的分类Be动词：is, am, are, was, were助动词：do, does, did, has, have, had动词
情态动词：can, must, may, should, 等实义动词：run, eat, play, like, 等等。陈述句改为一般疑问句的改法：一般疑问句：以be动词、助动词、情态动词为句首，句末有问号（？）的句子。例如：Is she a doctor. 她是一名医生吗？Has she got any grapes? 她有些葡萄吗？（这里的has是助动词，got（get的原形）是有的意思。Can you fly? 你会飞吗？当句子中的谓语只有实义动词，没有be动词、助动词、情态动词的时候，句子变一般疑问句时要加do、does、did（do、dose的过去式）其中之一。如：The fox likes grapes. 句子的谓语没有be动词、助动词、情态动词，只有likes，like是实义动词，因此，句首要加助动词；又因为the fox是第三人称单数，句首的助动词就用does. 句子的就变成Does the fox like grapes? 注意原来likes中的s，要删除。一般疑问句主语和be动词、助动词、情态动词倒装。没有这三类词时要加助动词。如：She
is
a doctor.
She
usually
goes
to school at seven.Is
she
a doctor?
Does
she usually go to school at seven?记住：实义动词始终在主语的后面。注意：述句（句子后面只有句号的句子）给成一般疑问句时，一般情况下，还要把第一人称I、we、my、our改成you、your，把some变成any。如：I
have
got some apples.
I
am
making
my
aeroplane.变成：Have
you
got any apples?
Are
you
making
your
aeroplane?We are watching TV. 变成：Are you watching TV?还要注意：如果has、have、had、do、does、did后面是名词时，has、have就不是助动词了，他们是实义动词。改一般疑问时不能提前（一般情况下，所有实义动词都不能提到主语前面），要根据时态加助动词do、does、did。如：She
has
breakfast everyday.
Does
she
have
breakfast everyday? 否定句的改法首先要认清“否”就是“不”的意思，在英语中就是not或not的省略形式n’t。否定句是在be动词、助动词、情态动词后加not或not的缩略形式n’t。人称不变化。实义动词不能直接加否定词，须加助动词doesn’t（第三人称单数）、don’t、didn’t。例如：I am English teacher. 改成：I am not （aren’t也可以）English teacher.She has got some apples. 改成：She hasn’t（has not也可以）got any apples. 注意：一些否定词hardly（几乎不）few（很少可数）little（很少不可数）nothing（没有）none（没有人或物）等也是否定词。含有此类否定词的句子也是否定句。am not的否定缩略形式是aren’t如：Su yang often plays football.可以改成：Su yang doesn't play football (at all).Su yang seldom plays football.Su yang never plays football. Some改成否定句一般也要改成any。仅供参考，希望对你有所帮助，学习愉快……
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