Light's

They can't have gone out because the light's on.

What is the light's wavelength?

I don't usually stop if the light's yellow.

Why are you stopping? The light's green.

"I'm afraid Tom's not at home." "But the light's on in his room!"

Tom's up. The light's on in his room.

Tom is up. The light's on in his room.

The light's too dim.

The light's on, but no one's at home.

The light's green. Let's cross.