Answered By: Writing Center
Last Updated: Nov 05, 2015     Views: 0

We use as only if two things happen at the same time. We use when if one thing happens after another.

e.g.: When I got home, I had a bath.

As I walked into the room, the phone started ringing.

We use as for actions and happenings. As + a situation usually means because.

e.g.: As we were asleep, we didn't hear the doorbell.

You cannot use as for time in sentences like this. You have to use while or when.

e.g.: The doorbell rang while we were asleep.

She got married when she was 23.

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