He has no sisters or brothers.这里用or He has no sisters and no brothers.这里用and
问题描述：
He has no sisters or brothers.这里用or He has no sisters and no brothers.这里用and
答
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。
答
and用于肯定或并列句中。or用于疑问或否定句中
答
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.