As

De Linuxmemo.

Quand 2 choses arrive en meme temps

I watched her as she opened the door.
turn off the lights as you go out.

"Just as" au moment exact

John arrived, just as i left.
I had toleave just as the conversation was getting interesting.

==Raison (because)

As i was feeling tired, I went to bed early.
As they live near us, we see them quite often