The vice-chairman helped with the preparation of the meeting.

The vice president performs the duties of the president in his absence.

This factory reuses the byproducts produced during the manufacturing process.

He is expressing his true self using a sub account.

He wrote a sentence using an adverbial particle.

My sinuses are blocked, and I have a headache.

My sinuses are blocked and I have a headache.

He is a famous author, and his works are loved by many readers.

He is an excellent doctor.

This contract includes a warranty against defects.