"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).

在市第74小学六年级的课堂上，前半节课，该校教师哈力曼·热西提讲解《花之歌》，讲解课文内涵。，此外，上海闵行警方对泰迪犬无证饲养作出了罚款200元的处罚，对金毛犬未戴嘴套作出了罚款50元的处罚。

今年，儋州进一步加大项目招引和建设力度，农业发展基础不断夯实、后劲不断增强。，多年来，在多方帮助下，刘誉富积极发展特色种养产业，并取得了一定成绩。

此起事故造成两车受损，民警经调查认定，货车驾驶员马某在转弯过程中未及时减速让行，是引发事故的主要原因，应承担本次事故的全部责任。， 临沂柳青苑小学相关负责人表示，学校将继续开展家校共育活动，促进家校间的沟通与合作，达成教育共识，形成教育合力，也希望家长们能够一如既往地关心和支持学校各项工作，共同打造孩子们美好的未来！ 通讯员 陈晓靖