爱华网英文句子种类：肯定句和否定句
陈述句分为肯定句和否定句，否定句中含有否定词。
肯定句例子1： Mr. Walker is an Englishman.否定句例子1：Mr.Walker is not an Englishman.
肯定句例子2： I have a sister.否定句例子2：I don’t have asister/I have not a sister.
肯定句例子3： He plays football in theafternoon.否定句例子2：He doesn’t play football in the afternoon.
否定句的表达方式基本上有下面的五种。
第一，句中有“be”动词时，在“be”动词后加not.
结构：主语+be动词+not+其他。其中be动词+not往往可以缩写：isnot=isn’t
are not=aren’t. wasnot=wasn’twere not=weren’t等。
例如：I am a good swimmer.变成否定句如：I am not a goodswimmer.
请将以下肯定句变为否定句。
1. You are afriend of his。___________________________________.
2. There weremany people at the party yesterday.__________________________________.
3. She is going to go to her birthday party.__________________________________.
4. I am very nice to you__________________________________.
5.They are students.__________________________________.
6.He was two years old then.__________________________________.
第二，句中有“have/has/had”表示“有”的含义时，否定形式两种均可：
1. have（/has/had） +not. 例如：I have much money.变成否定句如：I have not much money.
2.don’t/doesn’t/didn’t +have. 例如：I have much money.变成否定句如：I don’t have much money.
请将以下肯定句用两种形式变为否定句。
1.He has asister.________________________________________________
2.We have enough pencils.________________________________________________
3.She had a lovely time yesterday.
____________________________________________________________________
第三，句中有“have/has/had”表示“吃”的含义时，其否定式：don’t/doesn’t/didn’t +have
1.I have an egg and milk for breakfast.__________________________________
2.He has lunch at twelve.__________________________________
3.They had ice creams in Summer.__________________________________
日期___________ 姓名_____________班级_______________
第四，句中有“行为动词/实义动词”时，其否定式的结构为：
主语+don’t/doesn’t/did’t+行为动词/实义动词+其他。
举例：1.肯定句--They play football every Sundayafternoon.
否定句—They don’t play football every Sunday afternoon.
请将下列句子变成否定句。
1. He swimsin the sea.________________________________
2. They singvery well. ________________________________
3. We came to school every morning.________________________________
4.She studies very hard.________________________________
5.They run every morning.________________________________
第五，句中有“will，can，must、should”等变否定句时，在其后直接加+not.经常会缩写成：willnot=won’t cannot=can’t mustnot=mustn’t shouldnot=shouldn’t.
请将下列句子变成否定句。
1.I will do itagain.________________________________
2.I can sing and dance._________________________________
3.We must go to school before eight o’clock._________________________________
4.You should look jump on thebed.___________________________________________
