Question

The combined lights from all the stars (spreads, spread) out to form a band of light across the sky.

Answer 1

Spread

Step-by-step explanation:

The reason it is spread is because if there is any plural noun, it would have to be spread or like separate for example. But if it would be a singular, then it would be spreads or separates.

Answer 2

It would be spreads because that would mean it is present tense just like form.