Breakdown of Él quiere la contraseña para que revisemos el documento.
él
he
para
for
querer
to want
el documento
the document
Questions & Answers about Él quiere la contraseña para que revisemos el documento.
Why is the verb revisemos in the subjunctive here?
The phrase para que (so that) always triggers the subjunctive. It introduces a purpose or goal that hasn't happened yet. Because the subject changes from him (él) to us (nosotros), we have to use para que plus the subjunctive revisemos.
Could I just say para revisar instead of para que revisemos?
Not in this sentence, because the subjects are different. If he wanted the password so that he could review it himself, you would use the infinitive: Él quiere la contraseña para revisar el documento. Because we are reviewing it, you must use para que and conjugate the verb to match the new subject.
How can I tell that revisemos is subjunctive just by looking at it?
For regular -ar verbs like revisar, the normal present tense for nosotros ends in -amos (revisamos). In the present subjunctive, the vowel swaps to the opposite ending, making it -emos (revisemos).