The boy doesn't have a sister or brother.
这个男孩没有姐妹或者兄弟。
改肯定句：The boy has a sister or brother.
这个男孩有一个姐妹或者兄弟。
The boy dosen't have a sister or brother.改为肯定句
The boy dosen have a sister or brother.
The boy does have a sister or brother.
否定句改成否定句就可以把否定词去掉，即可以变成:The boy have some sister and brother.
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