What is the main verb of this sentence?

I have five pencils.

Japanese eels can live in both fresh and salt water.

He participated in the script reading for the theater company.

Honsei is a part of the law enforcement agency.

It's difficult to understand the main point of his story.

He decided to reprint the old book.

This book is a reprint.

He is playing the game on his main account.

This company is planning new investments to increase its capital.