有区别啊!动词+sb to do sth 中sb应是动词的宾语 to do sth 应为宾语补足语；如ask/tell/+sb to do sth .而动词+to do sth 中to do sth 应是动词的宾语如hope to do sth .(hope sb to do sth 是错误的）这两种结构中...