He claims to be a time traveller.

He has a deep interest in Futurist art.

He can write sentences using potential verbs.

We swear to be friends forever.

Let's try to predict tomorrow's weather using the future tense.

This program has become executable.

He is passionate about his research in futurology.

I want to travel to many countries.

His nature is very kind.

Detailed information is needed to understand the nature of that project.