- I was looking at her as she went away.
Two things happened at the same time.
As=at the same time as
- I dropped my phone as I was getting off the car.
Something happened as I was doing something else.
- Just as I got to bed, my mum came.
=Exactly at the moment I got to bed, my mum came.
- As the day went on, I was feeling worse.
Two things were happening together in a longer period.
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