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1、一般现在时变否定句的规则.(a) 含有 am is are 的句子,变否定句时,只需在 am is are 后加 not.例 1 This is a book. 否定句 This is not a book . 例 2 I am a teacher . 否定句 I am not a teacher . 例 3 These are pens .否定句 These are not pens .(b) 含有实义动词的句子，变否定句分两步。（1）如果主语是第三人称单数时，要在实义动词前加 doesnt,后面的动词用原形。例 1 He eats an apple.否定句 He doesnt eat an
2、 apple. 例 2 Jim does his homework.否定句 Jim doesnt do his homework.例 3 Marry goes to school. 否定句 Marry doesnt go to school.(2) 如果主语不是第三人称单数时，只 需在实义动词前加 dont. 例 1 I teach English. 否定句 I dont teach English. 例 2 They go to school. 否定句 They dont go to school. 例 3 We sing a song. 否定句 We dont sing a song. (
3、c) 含有情态动词的句子 ,变否定句时, 只需在情态动词后加 not. 例 1 I can dance. 否定句 I can not dance.或 I cant dance. 例 2 They can speak English. 否定句 They can not speak English. 或 They cant speak English. 例 3 He must go home. 否定句 He must not go home. 或 He mustnt go home. 例 4 He must be on the playground.He can not be on the pla
4、yground.析：当 must be 用来表示推测，有“一定” 的含义时，否定式要用 can not.例 5 You must say something at the mecting.You neednt say anything at the mecting.析：当“must+行为动词” 用来表示“必须”的含义时，其否定式可用 neednt 或 mustnt 表示 “不需要”，“ 不必”，语气委婉，must not 表示“ 禁止”，“ 千万别”语气生硬。例 6 You may come in now.You mustnt come in now.析：may 作为情态动词表示“可以”时，其
5、否定式用 must not,而不用 may not.例 7 He may watch TV .He mustnt watch TV.注意: (1) 见到 some 变否定句时,要换成 any. 例 1 I eat some apples. 否定句 I dont eat any apples.例 2 He has some books. 否定句 He doesnt have any books.例 3 He does his home work.否定句 He doesnt do his home work.(2) 见到 and 变否定句时,要换成 or.例 1 There is some air
6、 and water on the moon. 否定句 There isnt any air or water on the moon.例 2 He has some brothers and sisters. 否定句 He hasnt any brothers or sisters. 例 3 He eats apples and oranges.否定句 He doesnt eat apples or oranges.(3) 见到 too 和 also 变否定句时,要换成 either.例 1Tom goes to school too.否定句 Tom doesnt go to school
7、either.too 和 also 用于肯定句中时，否定句中用 either 替换。（4 见到 already 变否定句时,要换成 yet。例 1 He has had supper already.He hasnt had supper yet.随着对谓语动词的否定，某些副词也要作相应的变动。 一般现在时精炼一 将下列句子变否定句。例 1 I am a boy.例 2 You are a girl.例 3 He is a teacher.例 4 Jim is English.例 5 These are bikes.例 6 Those are maps.例 7 They are buses.例
8、 8 We are Chinese.二 将下列句子变否定句。例 1 Im a boy.例 2 Youre a girl.例 3 Hes a teacher.例 4 Its a pen.例 5 These are some bikes. 例 6 Those are maps and pencils.例 7 Theyre some buses and cars.例 8 She is your teacher.三 将下列句子变疑问句。例 1 I am a boy.例 2 You are a girl.例 3 He is my teacher.例 4 Jim is our English.例 5 Th
9、ese are some bikes.例 6 Those are my maps.例 7 They are some buses.例 8 We are Chinese.四 将下列句子变成疑问句。例 1 Im a boy.例 2 Youre a girl.例 3 Hes my teacher.例 4 Its a pen.例 5 These are some bikes.例 6 Those are maps and pencils.例 7 Theyre some buses and cars.例 8 She is your teacher.五 将下列句子变否定句。例 1 I teach Engli
10、sh. 例 2 They go to school. 例 3 We sing a song.例 4 He spells it.例 5 She goes to school.例 6 He does his homework.例 7 They do their homework.例 8 I do my homework.六 将下列句子变否定句。例 1 He teaches my English. 例 2 They speak English and French.例 3 We eat some apples.例 4 Jim spells it.例 5 She goes to our school.
11、例 6 He does some homework.例 7 They do their homework.例 8 We do some homework.七 将下列句子变疑问句。例 1 I teach English. 例 2 They go to school. 例 3 We sing a song.例 4 He spells it.例 5 She goes to school.例 6 He does his homework.例 7 They does their homework.例 8 I do my homework.八 将下列句子变疑问句。例 1 He teaches my Eng
12、lish. 例 2 They speak English and French.例 3 We eat some apples.例 4 Jim spells it.例 5 She goes to our school.例 6 He does some homework.例 7 They do their homework.例 8 We do some homework. 九 将下列句子变否定句。例 1 I can dance. 例 2 They can speak English. 例 3He must go home. 例 4 He must be on the playground.例 5
13、You must say something at the mecting.例 6 You may come in now.例 7 He may watch TV .例 8 We need speak English.十 将下列句子变否定句。例 1 I can dance and sing. 例 2 They can speak some English. 例 3You must go home. 例 4 They must be on the playground.例 5He must say something at the mecting.例 6 Jim may come in now.
14、例 7 They may watch TV .例 8 We need speak English and English.十一 将下列句子变疑问句。例 1 I can dance. 例 2 They can speak English. 例 3He must go home. 例 4 He must be on the playground.例 5 You must say something at the mecting.例 6 You may come in now.例 7 He may watch TV .例 8 We need speak English.十二 将下列句子疑问定句。例
15、1 I can dance and sing. 例 2 They can speak some English. 例 3You must go home. 例 4 They must be on the playground.例 5He must say something at the mecting.例 6 You may come in now.例 7 They may watch TV .例 8 We need speak English and English.十三 写出下列动词的第三人称单数形式。1 go 2 spell 3 speak 4like 5teach 6 Be 7 are 8 study 9 have 10 do十四 将下列名词变成复数。1 apple 2 orange 3 map 4 pen 5 pencil 6 desk 7 dog 8 tomato 9 photo 10 knife十五 将下列名词变成复数。1 man 2 woman 3 child 4 person 5people6 fish 7 s
