陈述句变为否定句和一般疑问句的规则：句式方法否定句1. 在 be 动词、情态动词、助动词的后面直接加 not am I am a teacher. I am not a teacher. is She is a student. She isn’t a teacher.1）be are They are from Shanghai. They aren’t from Shanghai.was Tom was born in Guangzhou. Tom wasn’t born in Guangzhou.Were There were thirty apples in box last night.. There weren’t thirty apples in box night. can Tom can swim. _________________ ____ could will2）情态动词 wouldshallshould, mustmay have They have finished their homework. 3）助动词 ______________________ ___________ has Tom has handed in his homework. ___________ ______________ 2.在实义动词前加 don’t/ doesn’t/ didn’t，动词变回原形。I like Maths. I don’t like Maths.Tom washes his clothes by himself.__________ _______ ____They had bread for breakfast this morning.________________ ____ I have some story –books.________________________________Tom has some beautiful flowers._______________________________1一般疑问句直接把 be 动词、情态动词、助动词放在句首。 am I am a teacher. Are you a teacher? is She is a student. _______ _______⑴直接把 be are They are from Shanghai.Was Tom was born in Guangzhou.were There were thirty apples in box last night. can Tom can swim. _______________________ could will⑵情态动词 wouldshallshould, must may have They have finished their homework. ⑶助动词 ________________________________________has Tom has handed in his homework.______________ __________2. 句子中含有实义动词的，就直接在句首后加Do/Does/ Did,而动词要变回原形。I like Maths. Do you like Maths?Tom washes his clothes by himself.______ _______________They had break for breakfast this morning.I have some story –books.________________________________Tom has some beautiful flowers._______________________________注意：1. have ,has, had ,它们有时作助动词，有时作实义动词，所以改为否定句或一般疑问句时，要想清楚它们是作助动词还是实义动词，才下笔。2. some 用于肯定句 any 用于否定句或一般疑问句式2
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