I don't know which of the following sentences you have to choose from, but a future tense sentence looks something like this:
"We are going to go to Hawaii this summer!" She exclaimed.
The girl in this example is telling her friends what is going to happen, therefore it's set in the future tense. Another example is:
The school group was going to go to the park to see the ballgame.
The future tense is basically explaining or saying something that hasn't happened yet or is going to happen.