问题描述：
肯定句变否定句
1.I like apples
2.I buy a pen.
3.I am a student.
4.you are my friend.
5.He is my brother.
1.I like apples
2.I buy a pen.
3.I am a student.
4.you are my friend.
5.He is my brother.
问题解答：
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