She goes to the gym every morning before work.
My brother plays football in the evening after school.
I enjoy reading books during the weekend.
Sentence 1:
The subject is "She," which is a pronoun, and it replaces a noun (a person) not mentioned in this sentence.
The predicate (main verb) is "goes," which is third person singular. The subject "She" is third person singular, so the subject and verb agree.
Sentence 2:
The subject is "My brother," a noun used as the subject. The predicate (main verb) is "plays," which is third person singular. The subject and verb agree because "brother" is third person singular.
There is no pronoun used here.
Sentence 3:
The subject is "I," a pronoun, which refers to the speaker. The predicate (main verb) is "enjoy," which is in the first person plural form (used with "I"). The subject and verb agree.
There are no other pronouns in this sentence.