Write two sentences that use a colon correctly. Make sure the two uses are different from each other.

1. Brianna can only think of one thing: winning the game.
2. I only like certain vegetables: peas, green beans, broccoli, and cauliflower.

Excellent -- both are fine.

To use a colon correctly, remember that it is used to introduce a list, explanation, or clarification. In the first sentence, the colon is used to introduce the idea that the only thing on Brianna's mind is winning the game. In the second sentence, the colon is used to introduce a list of specific vegetables that the speaker likes.