He should stop his selfish behavior.

He lost everything.

She is planning a date with her current boyfriend.

My boyfriend gave me a gift.

Everyone was surprised by the news.

He starts talking about himself at every opportunity, causing trouble for the people around him.

A healthy diet and moderate exercise help boost immunity.

He is an expert in mechanics.

The Earth maintains its shape due to centrifugal force.

He has a strong ability to get things done to make the project successful.