How can you tell if a pronoun is the subject or a predicate nominative? PLEASE HELP

Example Sentence: Is that __________ in line at the cash register?

A.
she; subject

B.
she; predicate nominative

C.
her; subject

D.
her; predicate nominative

Question

How can you tell if a pronoun is the subject or a predicate nominative? PLEASE HELP

Example Sentence: Is that __________ in line at the cash register?
 
 A.
she; subject
 
 B.
she; predicate nominative
 
 C.
her; subject
 
 D.
her; predicate nominative

anonymous · Answer

Please Help me, I understand what they are, I just don't understand how to tell which is which.

kyanthedoodle · Answer

I believe the subject is the noun or pronoun in the sentence, and the predicate nominative is the noun that follows the linking verb.

anonymous · Answer

thank you :)