floor. • 3.I can make the bed. • I can not(can’t) make the bed.
3.句子中既没有be动词也没有情
态动词时，借助助动词（do 和
does）,在助动词后+not,后边动
词还原.
don’t/doesn’t
• 1.I have an apple. • I don’t have an apple. • 2.She likes hamburgers . • She doesn’t like hamburgers . • 3. Li Shan has some bananas. • Li Shan doesn’t have any bananas.
助助动词（do 和does）,在助动词后+not,后边
动词还原.
don’t/doeare）动 词时，在be（am is are）后+not.
am not/isn’t/aren’t
• 1.She is a teacher. • She is not(isn’t) a teacher • 2.They are good friends . • They are not (aren’t)good friends • 3.Li Shan and Su Nan are students. • Li Shan and Su Nan are not (aren’t)
students.
2.当句子中有“情态动词” （can ,will）时，在“情态动词” （can ,will）后+not.
can’t/won’t
• 1.She can swim. • She can not (can’t) swim • 2.Li Shan can sweep the floor. • Li Shan can not (can’t)sweep the
把句子改为否定句
• 1.当句子中有be（am is are）动词时，在be （am is are）后+not. am not/isn’t/aren’t
• 2.当句子中有“情态动词”（can ,will）时，在 “情态动词”（can ,will）后+not. can’t/won’t
• 3.句子中既没有be动词也没有情态动词时，借