YOU SAID:

And I laughed when I saw him, in spite of myself;

INTO JAPANESE

そして私は彼を見たとき、思わず笑ってしまった。

BACK INTO ENGLISH

And when I saw him, I couldn't help but laugh.

INTO JAPANESE

そして彼を見たとき、私は思わず笑ってしまいました。

BACK INTO ENGLISH

And when I saw him, I couldn't help but laugh.