1、一般现在时变否定句地规则一般现在时变否认句的规如此. (a) 含有 am is are 的句子,变否认句时,只需在am is are 后加not. 例1 This is a book. 否认句 This is not a book . 例2 I am a teacher . 否认句I am not a teacher . 例3 These are pens . 否认句These are not pens .(b) 含有实义动词的句子,变否认句分两步。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.否认句 He doesnt
2、eat an apple. 例2 Jim does his homework.否认句 Jim doesnt do his homework. 例3 Marry goes to school. 否认句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. 否认句 I dont teach English. 例2 They go to school. 否认句 They dont go to school. 例3 We sing a song. 否认句 We dont sing a song.
3、(c) 含有情态动词的句子,变否认句时, 只需在情态动词后加not. 例1 I can dance. 否认句 I can not dance.或 I cant dance. 例2 They can speak English. 否认句 They can not speak English. 或 They cant speak English. 例3 He must go home. 否认句 He must not go home. 或 He mustnt go home. 例4 He must be on the playground. He can not be on the playgro
4、und. 析:当must be用来表示推测,有“一定的含义时, 否认式要用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, 其否认式可用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 e in now.You mustnt e in now. 析:may作为情态动词表示“可以时, 其否认式用must not,而不用may not. 例7
5、 He may watch TV .He mustnt watch TV. 注意: (1) 见到some 变否认句时,要换成any. 例1 I eat some apples. 否认句 I dont eat any apples. 例2 He has some books. 否认句 He doesnt have any books.例3 He does his home work.否认句 He doesnt do his home work.(2) 见到and 变否认句时,要换成or.例1 There is some air and water on the moon. 否认句 There i
6、snt any air or water on the moon.例2 He has some brothers and sisters. 否认句 He hasnt any brothers or sisters. 例3 He eats apples and oranges. 否认句He doesnt eat apples or oranges. (3) 见到too和also变否认句时,要换成either. 例1Tom goes to school too. 否认句 Tom doesnt go to school either.too和also用于肯定句中时,否认句中用either替换。4 见
7、到already变否认句时,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认,某些副词也要作相应的变动。 一般现在时精炼一 将如下句子变否认句。 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 We are Chinese.二 将如下句子变否认句。 例1 Im a boy. 例2 You
8、re 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 将如下句子变疑问句。 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 These are some bikes. 例6 Those are my maps. 例7 They ar
9、e some buses. 例8 We are Chinese.四 将如下句子变成疑问句。 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 将如下句子变否认句。 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 do their homework. 例8 I do my homework.六 将如下句子变否认句。 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.例6 He does some homework.
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