когда говорят о профессии/должности (I worked as a teacher. He used his book as a pillow.)
‘as adj. as’ (He’s not as reach as his concurrent. He ran as fast as he could.)
'as' между двумя предложениями (He’s a good driver, as his father is.)
You look as if you’ve seen a ghost.
You talk as though we’re never going to see each other again.
"as you know"
"as you suggested"
"as we agreed"
"as mine." /yours/his/hers/ours/theirs.
- сопровождаемый существительным или местоимением:
I’ve been working like a dog all afternoon.
None of my brothers are much like me.
She looks just like her mother.
когда говорят о предположении ("похоже что пойдет дождь"):
It looks like it’s going to rain.