YOU SAID:

I think that they did

INTO JAPANESE

私は彼らがいたと思う

BACK INTO ENGLISH

I think they were

INTO JAPANESE

だったと思います

BACK INTO ENGLISH

And it was I think

INTO JAPANESE

私だったと思う

BACK INTO ENGLISH

I think I was

INTO JAPANESE

だったと思う

BACK INTO ENGLISH

And it was I think

INTO JAPANESE

私だったと思う

BACK INTO ENGLISH

I think I was

INTO JAPANESE

だったと思う