The sentence that correctly uses a compound subject is:
Margo and they prefer swimming over running.
The other sentences contain grammatical errors regarding the use of pronouns.
Responses
My brother and me frequently visit the park.
My brother and me frequently visit the park.
His father and them are preparing breakfast.
His father and them are preparing breakfast.
Margo and they prefer swimming over running.
Margo and they prefer swimming over running.
Elissa and her are studying for an exam.
1 answer
The sentence that correctly uses a compound subject is:
Margo and they prefer swimming over running.
The other sentences contain grammatical errors regarding the use of pronouns.