"he enjoys their praising her children at school. using passive voice, 为什么要加being？"

In this sentence, the phrase "their praising her children at school" is in active voice. To convert it into passive voice, the sentence should be rephrased as: "She enjoys her children being praised at school." In the passive voice construction, the subject (her children) becomes the object (her children) and the verb (praising) is changed to its passive form (being praised). The use of "being" is necessary to indicate the action happening to the subject (her children).

提起查干湖，人们更多想到的是冬捕。， □本报记者 邹欣芮 特约记者 姚晶 通讯员 王嘉楠 岗位学雷锋 医路有传承 一路走来，辽健集团抚矿总医院传承华润健康的央企文化，秉持“一切为了大众健康”的使命，致力于将雷锋精神与医院文化相结合，不断提升员工的精神文明素质与服务患者的热情，凝聚奋发向上的精神力量，让雷锋精神在医疗服务实践中传承弘扬。

，有的不同意某路口的绿灯40秒变15秒；

推出“幸福家园安居贷”，帮助新市民安家，该贷款利率优惠、还款灵活，办理便捷。，而薛殊成为了沈琅的妃子，自然无法去和亲，最终沈止衣还是被迫去和亲，这也是没办法的事情，毕竟她是公主，和亲这件事本该是她去的，虽然姜雪宁劝阻，但是她还是要去。