warn的用法

warn的用法

warn怎么用？ｗａｒｎ后该跟哪些词，先看2008年呼和浩特乌兰察布中考试卷中有这样一道题：
　　There are some dangerous fishes in this river, and I’ve warned Jack ______ here.
　　A. not to swim B. to not swim
　　C. swim not to D. to swim not
　　答案是A。许多考生对这个答案疑惑不解，究其原因是考生对warn后该跟哪些词没有掌握。为此，本人特作如下归纳。
　　warn作动词，有“对(人)警告，提醒(某事)，告诫”之意，常见用法有：
　　1. warn+ n/pron。例如：
　　I won’t warn you again.
　　我不再警告你了。
　　2. warn + n/pron + to do。例如：
　　The teacher often warns us to study harder.
　　老师常常告诫我们要更加努力地学习。
　　Parents often warn their children not to play with fire.
　　家长常警告孩子别玩火。
　　3. warn + n/pron + of [about] + n。例如：
　　The morning paper warned of serious delays at the airport.
　　晨报提醒大家注意机场误点情况严重。
　　We warned them about the serious situation that they would have to face.
　　我们给他们谈了他们要面对的严峻形势。
　　4. warn + n/pron + against + doing…/n。例如：
　　I was warned against my neighbor.
　　别人警