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I'm having trouble getting the correct translation of the sentence because of
the で particle. I don't know if it's being used as a particle or the
imperative form of 元気.
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question
particle-で
Can someone explain the use of で in this sentence: 今日も元気で過ごせたらイイよね
The で is a particle. According to 明鏡国語辞典:

> で 〘格助詞〙  
>  ❹動作を行うときの **様態** を表す。「急ぎ足 **で** 歩く」「親子 **で** 出席する」「笑顔 **で** 答える」「土足 **で**
> 上がる」

The で expresses 動作を行うときの様態, the manner of an action, how or in what manner an
action is done.

In 「元気で過ごす」, 「元気で」 (vigorously, cheerfully, healthily) describes how the
action 「過ごす」 (spend the day) is done.

* * *

> the imperative form of 元気

元気 is a noun or na-adjective, so it has no imperative form, at least in the
modern Japanese grammar.
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2018-03-09T01:07:39.180
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answer
> 今日も元気 **で** 過ごせたらイイよね

で in the above sentence is used as a particle not as the imperative form of
元気.

"で is a case particle that indicates state or condition of action" in the
given sentence, which is made from にて by a euphonic change.  
These explanations are written
[here](https://dictionary.goo.ne.jp/jn/148951/meaning/m1u/%E3%81%A7/) as:

> 出典：デジタル大辞泉（小学館）  
>  ［格助］《格助詞「にて」の音変化》名詞、名詞的な語に付く。  
>  ５ 動作・作用の行われる状態を表す。「みんな **で** 研究する」「笑顔 **で** あいさつする」

The given sentence could be written as:

> 今日も元気 **な状態** で過ごせたらイイよね
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answer