It's important to believe in yourself.

He should stop his selfish behavior.

Since that's his own concern, we better not interfere.

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 strongly believes in the philosophical thought, 'I think, therefore I am.'

He is always the type of person who says this when that is said.

He is feigning ignorance about that problem.