Słownik angielskiego

If aliens exist, will they trouble the existing world views of the faithful?

You know, my problem is usually convincing people that aliens do exist.

However, since the aliens do exist, he could have been telling the truth.

However, as a human being, he hopes that such aliens in fact exist.

Imagine being in a position of knowing that aliens actually do exist!

He seemed too calm for someone who knew aliens existed.

I think these would be obvious assumptions, if you knew aliens exist and visited past cultures.

Find someone who believes aliens exist on other planets.

Taking a further step, and arguing that aliens actually existed, remained rare.

These reports don't prove aliens exist they just mean that someone saw something in the air.