What is the list of conjugation forms that occurred to 送る in the sentence

> 返事をしたつもりだったが、送れていなかった。
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question
translation conjugations て-form
What conjugation of 送る is used in 返事をしたつもりだったが、送れていなかった
It's the past-negative-potential-teiru form of 送る. This (て)いる refers to the
continuation of state.

  * **送る** : to send
  * **送れる** : (potential) to be able to send
  * **送れている** : (potential-teiru) have been able to send
  * **送れていない** : (negative-potential-teiru) have not been able to send
  * **送れていなかった** : (past-negative-potential-teiru) had not been able to send

The sentence means "I thought I replied, but [I noticed] I hadn't sent [the
mail] (successfully)".

Related:

  * [When is Vている the continuation of action and when is it the continuation of state?](https://japanese.stackexchange.com/q/3122/5010)
  * [Question about 金欠で久しく in the sentence 金欠で久しくスタバに行けてないけど・・・](https://japanese.stackexchange.com/q/12267/5010)
  * [ている vs ていた](https://japanese.stackexchange.com/a/57195/5010)
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2020-07-24T20:56:14.317
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2020-07-24T21:37:22.113
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answer
This 送れて is the _te_ -form of the "potential form" 送れる of 送る.

The potential form is sometimes used to mean that something was done
successfully

> メールを送れた  
>  I (successfully) sent the email ( _lit._ I was able to send the email)

In the sentence

> 返事をしたつもりだったが、 **送れて** いなかった

the _te_ -form (which together with いる may be used to express a state) is used
to express a state of "not having been sent (successfully)", so

> I was under the impression that I replied [to the email], but it hadn't been
> successfully sent
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answer