YOU SAID:

litearally me, when the impostor is suspicious

INTO JAPANESE

偽者が不審に思ったとき、私は驚いた

BACK INTO ENGLISH

I was surprised when the imposter was suspicious

INTO JAPANESE

偽者が不審に思ったときは驚いた

BACK INTO ENGLISH

I was surprised when the imposter was suspicious.

INTO JAPANESE

偽者が不審に思った時は驚いた。

BACK INTO ENGLISH

I was surprised when the imposter was suspicious.