I believe .My uncle can speak English welll.【I believe that my uncle can speak English well.】Did John go to the zoo yesterday?George asked.【George asked that whether John went to the zoo yesterday....第二个是疑问句，是不是应该用whether···ornot，而且你的回答中that与whether在一起好像不通顺对了，疏忽，低级错误！that去掉。or not加不加都行！