If I had a chance to do it again 中If的含义

if we had a chance to change it all again i do not want to m .If we had the chance to do it all again If I had the chance to do it all again什么意思 I 'd even see it again if I had a chance-如何理解此句的语法,had 不好理解 ﹏丶 if we had the chance to do it all again If we had the chance to do it all again,but haven't.是不是“如果我们 If we hsd the chance to do it all again. If you had to do it all over again,I mean,if she was here ri I had know,if you have a dream give it a chance to happen,ou If I had one more chance,I would try to know you once again if i have the chance to do it all if you have a chance to do something for it