含有 am is are 的句子,變否定句時,只需在am is are 后加not.
【例】This is a book. 否定句 This is not a book .
I am a teacher . 否定句I am not a teacher .
These are pens . 否定句These are not pens .
【例】He eats an apple. 否定句 He doesn't eat an apple.
Jim does his homework. 否定句 Jim doesn't do his homework.
Marry goes to school. 否定句Marry doesn't go to school.
【例】I teach English. 否定句 I don't teach English.
【例】 I can dance. 否定句 I can not dance. 或 I can't dance.
They can speak English. 否定句 They can not speak English. 或They can't speak English.
【注意】He must be on the playground. He can not be on the playground. 析：當must be用來表示推測，有“一定”的含義時， 否定式要用can not.
You must say something at the mecting.否定句 You needn’t say anything at the mecting.
析：當“must+行為動詞”用來表示“必須”的含義時，其否定式可用needn’t 或mustn't表示“不需要”，“不必”， 語氣委婉，must not表示“禁止”，“千萬別”語氣生硬。
You may come in now. You mustn't come in now.
析：may作為情態動詞表示“可以”時， 其否定式用must not,而不用may not.
have→do not have或don’t have
not have或doesn’t have (has要變成have)
【例】I have a pen. 否定句I don’t have a pen。
My father has a watch. 否定句 My father doesn't have a watch.
【例】I eat some apples. 否定句 I don't eat any apples.
He has some books. 否定句 He doesn't have any books.
He does his home work. 否定句 He doesn't do his home work.
【例】There is some air and water on the moon.
否定句 There isn't any air or water on the moon.
He has some brothers and sisters.
否定句 He hasn't any brothers or sisters.
He eats apples and oranges.
否定句He doesn’t eat apples or oranges.
【例】Tom goes to school too.
否定句 Tom doesn’t go to school either.
5、a lot of (=lots of)變為many或much。
【例】They have a lot of friends.(可數名詞)
否定句They don't have many friends.
There is lots of orange in the bottle.(不可數名詞)
否定句There isn't much orange in the bottle.
【例】He has had supper already.
否定句 He hasn’t had supper yet.