my brother warned me not to use his computer.是复合句吗?

不是复合句,是简单句.复合句必须有两个独立的主谓结构.
本句,My mother 是主语,warned 是谓语,me 是宾语,to use his computer是补语"don`t use my computer ."my brother warned me .怎么改为复合句？谢谢回答复合句：My mother warned me that I couldn't use her computer.提醒一下：如果是把 【"don`t use my computer ."my brother warned me】改为间接引语，答案就是my brother warned me not to use his computer。因为祈使句的间接引语是简单句，不是复合句。