A hungry wolf shouted at his pack.
A comfortable couch sat in the lounge, waiting to be accompanied.
A car ran down the highway.
A cell phone sang its ringtone.
A butterfly danced through the air.
A dinosaur settled down to rest.
Stars beamed the night sky, looking down on the earth.
Mountains sat omnipotently, watching over the surrounding villages.
Ocean waves ran along the shoreline.
A boiling pot sighed steam out once the lid was opened.
Answer:
Subject
Explanation:
Your sentence always needs a subject if not then your sentence would make no sense because you wouldn't be talking about a certain thing.