The original sentence is:

> 俺が呆れてものを言えないでいると、ハルヒはディジタルカメラを手にして、記念に写真を撮っておこうと言い出した。

I don't think the で in ～ない _で_ いると～ indicates て形 but rather I have the feeling
that ～ないでいると～ shows two situations that almost occur at the same time.

I would translate the above sentence as:

> While still in daze that I could not say/reply anything, Haruhi took a
> digital camera and said 'Let's take some photos as souvenirs'

or literally as:

> While I was in a situation where I could not express my astonishment,
> (before I could do anything), Haruhi took a digital camera and said "Let's
> tale some photos as souvenirs."
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2015-09-18T14:52:58.747
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2015-10-19T00:42:27.137
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question
grammar translation
What is the meaning of ～ないでいると～
ないで is the casual version of ず(に), which is similar to the なくて form, but
instead of meaning "didn't do (verb), and...," it means "without doing (verb),
...."

> 何も言わずに走った。  
>  何も言わず、走った。  
>  何も言わないで走った。  
>  Ran without saying anything.

As opposed to:

> 何も言わなくて走った。  
>  Didn't say anything and ran.

Of course the いると part makes it more complicated to translate, as I don't
think "without" fits in naturally. I think you basically got it, but here's my
try:

> 俺が呆れてものを言えないでいると…  
>  While I was still shocked and unable to speak...

[Tae Kim's explanation of ないで and
ず(に)](http://www.guidetojapanese.org/learn/grammar/negativeverbs2)
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2015-09-18T23:02:50.467
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2015-09-19T00:13:09.563
2015-09-19T00:13:09.563
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answer