What is the subject pronoun in the sentence: "She asked him to help her bathe their dog"?
She is the subject pronoun
The sentence could be written as She asked. She is the subject and asked is the verb.
Him is the object of the sentence. Him receives the action of the the verb 'asked'.
To is a preposition, To help her bath their dog is the prepositional phrase that tells what she was asking.
As her is direct object of the verb 'help', part of the prepositional phase is it not part of the subject.