2、词汇:
He was not well-known among senior citizens and adults建议改为He is not well-known among the older generations,因为20多岁、30多岁也有很多人很喜欢周杰伦啊,周杰伦出道的时候30多岁的人还在读中学。。。。
music which can be welcome in the world建议改为will be popular around the world。
3、语法:
My parents have hear...应该为have heard (ear发类似“厄”,不发“意尔”)
He was regarded not only as a famous singer, but also a great person应为He is...。要是他死了或者过气了你可以说was。