Had known it earlier,I would not have gone back!在过去之前知道得早点 应该是过去完成时阿！
问题描述：
Had known it earlier,I would not have gone back!
在过去之前知道得早点 应该是过去完成时阿！
答
有 肯定！
因为 go不能用于完成时的阿！
因改为have known it earlier, i would went back!
答
没
答
Had known it earlier, I would not have gone back!
如果听起来有点别扭
如果我说这句话的话 我会说
if i had know it earlier, i wouldn't/would not have gone back!
听起来顺口点
答
有
前后时态错了
答
原句是If I had known it earlier,I would not have gone back!(与过去事实相反,虚拟语气)这里从句与主句主语一致,省略了I和if,是正确的句式.
答
没有错， had known是过去完成时，整个句子是由if引导的虚拟条件句，只不过省略了IF，将had 倒装而已。
三楼的句子错了，would是情态动词，后面绝对是跟动词原形。