以下三种结构都是正确的表达：
1 Jack wanted to surf the Internet but his father told him NOT TO.
2 Jack wanted to surf the Internet but his father told him NOT TO DO SO
3 Jack wanted to surf the Internet but his father told him NOT TO DO THAT/ IT.
在你的句子裏面,少了to:tell sb to so sth
tell sb not to do sth.
天天向上.