Learn English – What would be a valid replacement of “as”

phrasingword-choiceword-usage

Say I want to write something to say:

John looked over his shoulder as he opened the door slowly.

However, for stylistic reasons I don't really want to use as in that sentence. There must be other ways of expressing simultaneity. What words or phrasing could replace the as in that sentence?

The Help Center here says

To prevent your question from being flagged and possibly removed, avoid asking subjective questions where every answer is equally valid: “What’s your favorite ______?”

… so please explain your choice and why your suggestion works [e.g. its grammar] as that introduces some objective measure of validity.

Best Answer

The adverb makes 'he opened the door slowly' non-punctive. It is not clear whether 'looked' is describing a punctive act or a durative one.

If the former (the apparent tautology is idiomatic):

John opened the door slowly, taking a swift glance over his shoulder as he did so. /

John took a swift glance over his shoulder as he slowly opened the door.

If the latter:

John opened the door slowly, all the while looking back over his shoulder.

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