And they've known for just as long that the aliens are coming.

And, of course, I can't tell her where the aliens come from.

So the aliens had come and gone, but to what purpose?

We always thought the aliens would come and teach us.

"I think we can be sure now that the aliens came here after they left their ship."

If the aliens do not come, sooner or later you will.

She would be of little help to him if aliens came aboard.

They'd agreed to try and had been hoping, before the aliens came.

These aliens came to live among the population of Earth, changing society forever.

His company had just shut down and laid everyone off after the aliens came.