祈使句变为间接引语最好是变为sb asked(told) sb to do sth.
例如：Lily said,"lend me some money."可变为Lily asked me to lend her some money.
你那个例子不是祈使句变为间接引语,而是疑问句变为间接引语.一般疑问句变为间接引语,是变为一个由if 或whether引导的从句,特殊疑问句变成间接引语,要变成一个由相应特殊疑问词引导的从句(注意变成从句后要用陈述语气）.例如：
He asked,"when will you come back?"变为
He asked when I would come back.