问：look back,look on ,look down on ,look forward to

问：look back,look on ,look down on ,look forward to look look down 还有look on?和look forward to? look down on look back on造句 look down to和look down on有什么区别? look back on与look back into look up/look forward to look back on还是to,think back on 还是to look down;look at;look down at;look down on区别? I really look down on I look down on you disdain look down on you