英文翻译 ，我甚至认为那是我写的！

可以有两种翻译法,
1:I even thought that it were written by myself.
2:I even thought it written by myself.

I even considered that it were written by me

I even thought it was written by me

不对，因为在现实中，文章不是你写的，因此你应该用虚拟语气。

而在虚拟语气中，be动词多用 was 的形式。

所以，应该是 I even thought it was written by me

I even considered that was written by myself.

I even thought that it was written by myself。