He has no sisters or brothers.这里用or He has no sisters and no brothers.这里用and

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Hehasnosistersorbrothers.这里用orHehasnosistersandnobrothers.这里用andHehasnosistersorbrothers.这里用orHehasn

He has no sisters or brothers.这里用or He has no sisters and no brothers.这里用and
He has no sisters or brothers.这里用or He has no sisters and no brothers.这里用and

He has no sisters or brothers.这里用or He has no sisters and no brothers.这里用and
He has no sisters or brothers中的or是连词“也不”意思,前面用no 否定sisters,后面用or否定了brothers;
He has no sisters and no brothers.,前面用no 否定sisters,后面用and起连接作用,再用一个no才可以否定掉brothers,因为and是没有否定意义的.

and用于肯定或并列句中。or用于疑问或否定句中

两句均表示他没用兄弟或姐妹。第一句用or是因为句为否定,由and转换;后一句and表示前后并列的关系,句式不为否定。