Новая инфа для запоминания.
As = at the same time as
Example: As i walked along the street, I looked at the shop winows.
As the day went on, the weather went worse.

As = because
Example: As i was hungry, I decided to find somewhere to eat.
I couldn't contact David as he was on holiday.

Если события происходят не в один и тот же момент, а поочередно, то используем When.
Example: When i got home, i had something to eat.