YOU SAID:

People do things, I guess.

INTO JAPANESE

人々 は、物事を行うと私は推測します。

BACK INTO ENGLISH

I guess people do things.

INTO JAPANESE

私は人のものだと思います。

BACK INTO ENGLISH

I think of those things.

INTO JAPANESE

私はそれらの事と思います。

BACK INTO ENGLISH

I think of those things.