变否定句的方法及习题：一、句中有Be(am,is,are,was,were)动词的时候，直接在Be(am,is,are,was, were)动词后加not, 通常缩写。

Lg.1.There is a school near the bank.----There isn’t a school near thebank.2.I was reading a book at that time.—I wasn’t reading a book atthat time.3.They were taking photos.------They weren’t taking photos.二、句中有情态动词时候，在情态动词（can, may, must, might, will, would, should…）后加not, 通常缩写。

Lg.1.I will help to clean up the city parks.----I won’t help to clean up the city parks.2.She should come back on time.----She shouldn’t come back on time.三、句中没有Be动词和情态动词的时候，在动词前面加don’t、doesn’t或didn’t，动词用原形。

过去时用didn’t; 一般现在时,当主语是第三人称单数(He, She,It, 或单个的人或物)的时候用doesn’t，其它都用don’t.Lg.1.An old man tried to move the mountains.----An old man didn’t try to move the mountains.2.You need to take breaks away from the computer.-----You don’t need to take breaks away from the computer.四、完成时态时，变否定句，直接在have/has后加not, 通常缩写为haven’t/ hasn’t+v过去分词。

I have already read Treasure Island.---I haven’t read Treasure Island yet.She has gone to Shanghai.------She hasn’t gone to Shanghai.注意：1.通常some改为any, too改为either; already改为yet.例如：I have some books----I don’t have any books.I can read English books, too.—I can’t read English books, either.I have already done my homework.-----I haven’t done my homework yet.分类练习：一．有be动词的句子变否定句：1.He is watching TV at that time. (改为否定句)He ________ _________ TV at that time.2.They are playing football with their friends. (改为否定句)They________ ________football with their friends.3.They were teachers in this school 8years ago. (改为否定句)_________ __________ teachers in this school 8 years ago. 二．有情态动词的句子变否定句：1.I will give out food at the food bank next Sunday. (改为否定句)I________ __________ out food at the food bank next Sunday.2.He can work out the problem easily. (改为否定句)He___________ __________ out the problem easily.3.He should give up smoking. (改为否定句)He ________ _________up smoking.三．没有be动词和情态动词的句子变否定句:1.He does his homework every day. (改为否定句)He___________ __________ his homework every day.2.Lisa hurt herself at home. (改为否定句)Lisa_________ _______herself at home.3.She has to go there on foot. (改为否定句)She_________ ________ to go there on foot.四．完成时态的句子变否定句：1.I have already finished reading the book. (改为否定句)I _________ ________ reading the book yet.2.She has received some letters from her pen pal. (改为否定句)She _______ _______ any letters from her pen pal.3.Tom has been to Beijing twice. (改为否定句)Tom_________ _________ to Beijing Twice.综合训练(改为否定句) ：1.I was doing my homework at 9:00 yesterday (改为否定句)I________ _________my homework at 9:00 yesterday. 2.I brought something special to Tom yesterday. (改为否定句)I__________ bring _________ special to Tom yesterday. 3.She was waiting for the bus at that time. (改为否定句)She_________ ________for the bus at that time.4.He does his homework at 8:00. (改为否定句)He_________ _________ his homework at 8:00.5.They were reading in the library at that time. (改为否定句)They ________ ________in the library at that time.6.I’ve had this bike for three years. (改为否定句)I_______ _________this bike for three years.7.She has taken acting lessons since last year.(改为否定句)She_______ _________ acting lessons since last year. 8.You should put the medicine on the cut. (改为否定句)You ________ _______the medicine on the cut.9.I need to take breaks. (改为否定句)I ________ __________ to take breaks.10.T hey are going to the West Lake. (改为否定句)They________ ________ to the West Lake.11.H e used to play soccer. (改为否定句)He ______ ________ to play soccer.12.T he workers set up a new library in the city last year. (改为否定句)The workers_______ ______up a new library in the city last year 13.H e has to clean his room every day. (改为否定句)He _______ _______to clean his room every day.14.H e has kept the book for one week. (改为否定句)He_________ _______the book for one week.15.I think two hours of TV is enough for you. (改为否定句)I________ _________ two hour of TV is enough for you.16.I think she will come here next week. (改为否定句)I_______ think she _______ come here next week.17.J im spent five hours in finishing drawing the picture. (改为否定句)Jim_______ _______ five hours in finishing drawing the picture.18.Y ou should talk to your friends. (改为否定句)You________ ______to your friends.19.H e has to get up early to catch the early bus. (改为否定句)He________ _________ to get up early to catch the early bus.20.H e has told you about the story many times.(改为否定句)He_________ _________you about the story many times.21.J ack thinks this football game is fair. (改为否定句)Jack_________ think this football game________ fair.22.H e came up with the idea last night. (改为否定句)He__________ __________ up with the idea last night.23.M aybe you should take a good rest.(改为否定句)Maybe you _________ ________ a good rest.24.T hey were singing at this time yesterday. (改为否定句)They________ ________ at this time yesterday.25.H e’s already listened to that song many times.(改为否定句)He_______ listened to that song many times________. 26.L ucy has cleaned her room. (改为否定句)Lucy_________ ________ her room.27.I have something important to tell you. (改为否定句)I___________ have __________important to tell you. 28.T he match has already begun.(改为否定句)The match_______ begun________.29.I have already bought a new car. (改为否定句)I _________ ________ a new car yet.30.I have been to the Great Wall. (改为否定句)I________ ________ to the Great Wall.。