Is the underlined verb helping, action, or linking?

During the storm, the tree house collapsed.

Is the following underlined verb action, linking, or helping?

The next day, they decided to rebuild the house.

Is the following underlined verb action, linking, or helping?

It seemed impossible, but they worked hard.

Is the underlined verb action, linking, or helping?

Finally, they did finish it, and it turned out great.

Is the underlined verb action or linking?

The dog smelled a cat and started barking.

Is the underlined verb action or linking?

This milk smells rotten.

Is the underlined verb action or linking?

Our new neighborhood looks very dangerous.

Is the underlined verb action or linking?

I looked out the window and saw something dark.

At 18 months, the puppies learn special skills.

Some puppies might be better at one job.

Identify the verb in the following sentence:

World War II was the most destructive war in human history.

Identify the type of verb in the following sentence. The verb is red.

Every month, bands from across the country visit New Your City.

The girl was frightened.

Audrey cooked spaghetti for her friends.

The boy looked sad.