语法
1、When it happened,it指代不明。
2、as regarding to the frequency,没有as也没问题,更简洁。
3、is revolving around应该是revolves around。
4、There are 三个人名 应该是They are 三个人名。前面已经用过There are了。
正如我们不会说 There is a cook. There is Tom.而会说There is a cook. He is Tom.
当然,There is a cook called Tom大概会更好一点。
5、who not knows nothing 应该是who knows nothing