It Is a compound sentence since you can choose to drive with us is an independent sentence and you can choose to walk with them the other independent sentence joined by the conjunction or
The answers of the given sentences above are the following:
1. The pronoun "he" in this sentence is used as a SUBJECT.
2. The pronoun "she" in this sentence is used as a PREDICATE NOMINATIVE.
3. The pronoun "he" in this sentence is used as a PREDICATE NOMINATIVE.