Pronoun Island: subjectpronoun/objectpronoun examples

Here are some example sentences using my subjectpronoun/objectpronoun pronouns:

Subjectpronoun went to the park.

I went with objectpronoun.

Subjectpronoun brought possessivedeterminer frisbee.

At least I think it was possessivepronoun.

Subjectpronoun threw the frisbee to reflexive.