As. as – такой же как, так же. как

He is as tall as his father. Do it as quickly as possible. His hair is as white as snow. I like good literature as much as you.

As – в качестве

He works as an economist.

As well – также

Everybody was there. Peter came as well.

As – когда, в то время как

As I was walking in the street I met my old friend. As I was leaving home, it began to rain.

As soon as – как только

He'll come as soon as the lessons are over.

As – поскольку, так как

As it was a long way to go I took a taxi.

As long as – пока, до тех пор пока

He can stay there as long as he likes.

As far as – настолько

As far as I know he was not there.