原本以为I thougut后面用一般过去时还是过去完成时?什么时候用would have done形式?

I thought - 我以为 (但现在不是这么认为了),故一般用过去式.I thought I loved you then.I thought I lost you.I thought she knew.I thought I knew it all.I thought I did really well on the test.
都是一般的藉口