i would 和 i had

i would 和 i had had i known it ,i would have.. 怎么区分I’d 是I had 还是I would I’d 是I would fail?还是I had fail? he would have if i had asked I had rather not.和 I would rather not.有什么区别 If I had time,I would come to see you. if i had. i would have这是什么语法? If I had only 24 hours to live,I would If I had wings,I would fly in the sky. Had I know it,I would have told you. I had _______ that I would always remember it.