If I were he or him

It is not difficult to get it right what pronoun we should choose if we remember one simple rule: if a pronoun goes after a linking verb, we use it in the subjective case, not the objective one.

Yes, the verb 'were' acts here as a linking verb because it links not the action but what the subject is: If I were he - there is no any action here.

Then, let's remember the basics:

Subjective pronouns Objective pronouns
I me
You you
He him
She her
It it
We us
They them

 

For example 👇

If I were he, I would go to the GYM regularly.

If I were she, I would study harder.