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The following sentence appears on a
[page](https://i.stack.imgur.com/BW6iZ.jpg) in my book:

> 悪夢 **から** 一夜明け、アインの **もとで** 訓練を重ねる日々が始まった。

I think the above から has the meaning of "after"; but the suspicious
possibility of the から being a questioning か with the suffix of ら niggles at
the back of my mind. So I must ask, is it parsed as から or is it a questioning
か + ら suffix?

**Secondary Example of ら-Suffix**

> (Found on [Jishio.org](https://jisho.org/search/ra))
>
> 諸君 **ら** のたゆまぬ努力と労働によって、ついに我らがアジトが完成した！！

[Jishio.org](https://jisho.org/search/%E4%B8%8B) has various definitions on
もと, however; I decided the following definition of もと is the most applicable
to my sentence based on context (アイン **のもとで** 訓練 = ...training under Ein...):

> Noun
>
>   1. under (guidance, supervision, rules, the law, etc.)​often のもとに or のもとで
>

Is the reason the dictionary claims のもとで/もと is a noun because the given
definition of "under" can be loosely considered a 'place' in the physical
direction sense, or is it a cross-language-barrier issue (I.E. considered a
noun in one language but not the other)?
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question
usage parsing nouns
How to parse the following から and is the もとで a noun?
> 悪夢 **から** 一夜明け、アイン **のもとで** 訓練を重ねる日々が始まった。

The から is a 助詞(particle), meaning "after~" (or "from~" "since~").

(The plural suffix ら should be attached to a noun or pronoun.)

* * *

> Is the reason the dictionary claims のもとで/もと is a noun

I don't think they claim のもとで is a noun. They're saying もと (下) is a noun, and
that ～のもとで can be used to mean "under~~".

I think you could think of it like this:

「～の+もと+で」 _lit._ "at + the foot + of~" → "under~"

Compare:  
「～の+前+で」 _lit._ "at + the front + of~" → "before~"  
「～の+そば+で」 _lit._ "at + the proximity + of~" → "by / beside~"  
「～の+ため+に」 _lit._ "for + the sake + of~" → "for~"  
(前、そば、ため are nouns.)
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answer