None of the sentences provided use a compound subject correctly. However, the first response is repeated, so here is the analysis for each sentence:
-
"My brother and me frequently visit the park."
- Incorrect: It should be "My brother and I frequently visit the park."
-
"Elissa and her are studying for an exam."
- Incorrect: It should be "Elissa and she are studying for an exam."
-
"His father and them are preparing breakfast."
- Incorrect: It should be "His father and they are preparing breakfast."
-
"Margo and they prefer swimming over running."
- Incorrect: It should be "Margo and she prefer swimming over running."
For correct usage, here are examples of compound subjects:
- "Margo and I prefer swimming over running."
- "Elissa and I are studying for an exam."
If you need one correct option from all the provided sentences, none apply.