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陈述句：是用来陈述一件事情或表示一种看法，可分为肯定句和否定句两种形式。
1、谓语动词是be动词,
助动词have, has, will,
情态动词can等时，只要直接在这些词后面加not就构成否定形式。
eg. Lily has already read this new book. (改为否定句)
Lily ______ ______ this new book ________.
2、谓语动词是行为动词而又没有助动词或情态动词时，必须在谓语动词前加助动词，
一般现在时加助动词do ，第三人称单数加does，一般过去时加did，再和not构成否定结构。必须指出的是：don't, doesn't, didn't后都用动词原形。
eg.1)Jill has lunch at school every day. (改为否定句)
Jill _____ _____ lunch at school every day.
2)The children had a good time at the party. (改为否定句)
The children ______ _____ a good time at the party.
3)Rose didn't drink any milk this morning.（改为肯定句)
Rose ______ ______ milk this morning.
二、疑问句：是用来提出问题的句子。
A.一般疑问句：以be动词, have /has/do等助动词、can/may等情态动词开头，以yes或no来回答的问句。
它的基本结构是：Be/Have /Has/Did等助动词（包括情态动词）＋主语＋谓语（包括
表语）＋┄？回答常用简略回答。
1、谓语动词是be动词、助动词、情态动词时，只要直接把这些词置于句首，句末改成问号。
eg. There's something wrong with his bike.（改成疑问句）
______ _____ _______ wrong with his bike?
2、谓语动词是行为动词时，必须在句首加上助动词Do、Does（三单）、Did（过去式）加上这些助动词后，句子中谓语动词必须用原形。
eg. 1)Edison built a science lab himself when he was ten. （改成疑问句）
______ Edison ______ a science lab himself when he was ten？
2)Those Japanese like Chinese food.（改成疑问句）
______ those Japanese ________ Chinese food?
注意：在把肯定句改成否定句或一般疑问句的时候,要注意句中是否有already、some、something、somebody等词，如果有也必须进行改变，already要改成yet，some、something、somebody等分别改成any、anything、anybody等。另外，在改成否定句的时候注意把too改成either,both改成neither,all改成none等.在改成一般疑问句的时候，常常把第一人称I、we改成第二人称you。
B.特殊疑问句：以疑问代词或疑问副词开头，提出疑问的句子。
它的基本结构是：特殊疑问词＋一般疑问句语序。但是如果疑问词在句子中作主语或作主语的定语，就用特殊疑问词＋陈述句语序。常用的疑问词有：what, who(whom), whose,which,when,where,how,why等，回答时针对问句中的代词和副词来回答，不用yes或no来回答。
1)对指物名词或谓语动词提出疑问，疑问词用what
①The twins were making a kite when their mother came in. （划线提问）
______ _____ the twins _____ when their mother came in?
②Mrs Turner asked her son to buy some eggs for supper. （划线提问）
_______ ______ Mrs Turner ask her son ______ _______?
2)对名词前定语提出疑问，疑问词应用which，而且必须和名词连用。
I'm going to take the shirt on the right.（划线提问）
______ _____ are you going to take?
3)对指人名词或代词提问用who，作宾语时提问用whom。
eg.Li Ping,they,his father
4)对物主代词和名词所有格提问用whose。
eg. Li Ping's coat→Whose coat my father→Whose father
5)对具体时间提出疑问，如 in the morning,last Sunday等，疑问词用when；对具体几点钟提问，疑问词应用what time。
6)对具体地点提出疑问，疑问词应用where。
The pupils are having a picnic at the foot of the hill. （划线提问）
_____ _____ the pupils having a picnic?
7)对表原因的
从句提问，常见的有because引导的从句，疑问词应用why。
Xiao Cheng didn't go to the farm with us because he was ill. （划线提问）
_______ _____ Xiao Cheng go to the farm with us?
8)对方式或程度等提出疑问，用疑问词How。
eg. go by bike like very much
9)对数量提出疑问，疑问词为How many，要注意how many必须跟名词的复数形式。
eg. two hundred sheep→How many sheep
10)对价格提出疑问，疑问词用How much。
eg. I paid fifty yuan for the sweater.
______ ______ did you pay for the sweater?
11)对时间长度提出疑问，疑问词应用How long。
eg. I've worked in that factory for two years. （划线提问）96中考题
______ _____ _______ you worked in that factory?
12)对时间频率，如 once a year, twice a week等提问，疑问词用How often。
13)对具体次数，如 once, twice, three times等提问，疑问词用How many times。
eg. ______ did he call you the day before yesterday?Twice. 96中考题
A.What time B.How many times C.How much D.How long
14)对in＋一段时间提问，疑问词一般用How soon。
eg. Jane and her brother will finish the work in two hours. （划线提问）
_____ _____ _____ Jane and her brother finish the work?
15)对距离提出疑问，疑问词用How far。
eg. It's about two kilometres from here to the country.（划线提问）
______ _____ _____ _____ from here to the country?
16)另外，对日期、星期、天气等提出疑问，则分别用
What's the date?
What day is it ? 如果是过去时间，就用was代替is。
What's the weather like?
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