Which sentence is written in the future tense?

• A. The forecast predicts rain next week.
• B. They travel tomorrow.
• C. They traveled yesterday.
• D. They will travel tomorrow.

Answer: (D)

Future tense is used to talk about actions that will happen later, often with the helping verb will. In the sentence They will travel tomorrow, the form will travel shows the action is set for the future. The other sentences use different tenses: predicts is present tense, travel is present simple (even with a future-looking time word), and traveled is past tense. So the sentence with will travel tomorrow clearly marks future action.