He is really knowledgeable and always teaches us new information.

He found out the truth and was surprised.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He is a new member of our team.

He is a member of that company.

He is an important employee of that company.

He is known as an expert in criminal investigation.

He cooperated with the police as part of a sting operation.

She is planning a date with her current boyfriend.

He lost everything.