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In the following sentence, what is the usage of the particle で?

> 彼は、先生と話すときと友達と話すとき **で** 、ことばや話し方をうまく使い分けている。

Can で indicate time?
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2021-03-09T12:07:17.553
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2021-03-09T14:53:47.257
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particles particle-で
Usage of で in 〜時で
No, this で is associated with the verb 使い分ける. ～で使い分ける means "to use (things
differently) _by_ ～" or "to use (different things) _according to_ ～". This で
before 使い分ける is interchangeable with によって.

  * 自動車を目的で使い分ける  
to use different cars according to the purpose

  * 気分で香水を使い分ける  
to use different perfumes depending on your mood

  * 彼は、先生と話すときと友達と話すときで、ことばや話し方をうまく使い分けている。  
He uses different words and ways of speaking properly depending on whether he
is talking to his teachers or his friends.

Similar で is found in 日付で並び替える "to sort by date".
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2021-03-09T14:37:22.603
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2021-03-09T14:53:47.257
2021-03-09T14:53:47.257
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