You can use it in lots of different ways.

So let's have a look at four

of them together.

You can use 'as' - number one -

to compare two people or things.

'Tokyo is as big as Los Angeles.'

(more or less)

Number two: to describe somebody's job:

'I used to work as a waitress.'

(And no, I wasn't very good),

or to describe something's function:

'Did you know that you can

use olive oil as shampoo?'

Me neither!

Number three: to say that something

happened at the same time

as something else.

'You rang me just as i was texting you.'

Number four: to give a reason like 'because'.

'As the sun is shining today

I think i might go for some fresh air after this.'

And as you have hopefully been

learning something new, why don't

you practice one of these in the comments now?