Pronoun

dadou wrote:Hi guys, just started to study for the GMAT, english is not my native language so help me out. i came across this examples:
incorrect: it must have been her at the door
correct: it must have been she at the door

incorrect: I wish i were him
correct: i wish i were he

apparently the verb to Be must always be followed by a subject pronoun. is it true? just need to comfirm

This is a cases of pronouns subject. We could skip the details of the subject (such as the three cases: subjective, objective, and possessive), and dive straight into strategy.

The way to handle this question is to use that voice in your head to ask the question: "Who is at the door?" There are two options: she (subjective) or her (objective). Now, if you use "her" then the answer to the voice in your heard would be: "Her is at the door." This is sounds iffy. However, try answering the other option "she." This will yield to: "She is at the door."

ooooook, i got it. when u try to find the answer of that question, you can easily find what is the subject. now i understand. thanks. But is it rule works only for the verb to Be or for all verbs?