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例如：
I am a teacher.
I like apples..
I am not a teacher.
I don’t like apples.
2)
肯定句和否定句之间的转换
1.
通过观察这些例句
如：
My father is a taxi driver.
→ My father is not (isn’t) a taxi driver.
There are some apples on the table.
→ There are not (aren’t) any apples on the table.
She was a student two years ago.
→ She wasn’t a student two years ago.
He can play football very well.
→ He can not (can’t) play football very well.
Mary will come to China next week.
→ Mary will not (won’t) come to China next week.
2．观察下面例句：
如：
I like listening to pop music.
→ I don’t (do not) like listening to pop music.
He goes to work every morning.
→ He doesn’t (dose not) go to work every morning.
Linda drove to school last night.
→ Linda didn’t (did not) drive to school last night.
如果句子中没有be动词、助动词
Will和have或情态动词，则需要借助助动词do, does或did，并not