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I was reading something which is supposed to mean "Why is it moving?". I would
translate it as なんで動いているか？ but it actually says なんで動いてんだ？

What's the difference between them? I think I cannot capture that nuance.

I think that 動いている it's something that it's moving at this time whereas 動いてんだ
sounds more like I'm stating that it's moving, but I find the lack of tense
disturbing (maybe it's a very strong statement implying surprise).

Another question: Could I even say なんで動いてんだった？ meaning "why was it moving?"
instead of なんで動いていたか？
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2017-08-29T19:57:09.960
52819
2017-08-30T02:37:44.323
2017-08-30T02:37:44.323
9478
question
grammar contractions
Why progressive tense (～ている) is not used in this case?
~てんだ is just a spoken contraction of ~ている の だ, so you have your continuous
tense, and also a のだ, which is sort of an exclamation mark added to the
question.
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2017-08-29T21:40:28.453
52823
2017-08-29T21:40:28.453
25260
52819
answer