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> 情報の真偽を確かめるまで帰れなくなった

What does なくなった add? I'm parsing なくなった as なくなる or the negative form of なる to
become. So loosely it sounds like, "you will lose the ability to leave"。

> 情報の真偽を確かめるまで帰れない

Is this the same or correct when just using ～ない, not allowed to leave？
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2018-06-05T07:00:59.920
59253
2018-06-05T16:32:28.480
2018-06-05T16:32:28.480
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30106
question
negation
Using ～なくなった vs. ～ない
The verb 「なる」, which is a key verb in the language, always describes a change
of state as in:

・A turns into B.

・A becomes more/less (adjective).

・Situation A changes to situation B.

> 「情報{じょうほう}の真偽{しんぎ}を確{たし}かめるまで帰{かえ}れなく **なった** 。」

This sentence talks about a (fairly recent) change of state as below:

**Old state** : One was free to leave or was about to leave.

_Something happens that changes all that_. ← Perhaps a new piece of
information has come in.

**Present state** : One cannot leave until the authenticity of the information
has been verified.

Old state （帰れた）⇒⇒ New state （帰れなくなった）

「帰れなくなった」＝「帰れる」+「ない」+「なる」 in the past tense

Thus your first sentence means something along the lines of:

> "It has (just) become impossible for me/us to leave until the authenticity
> of the information has been verified."

Your second sentence:

> 「情報の真偽を確かめるまで帰れない。」

says nothing about a change of state (like your first sentence does). It just
means:

> "One cannot leave until the authenticity of the information has been
> verified."
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2018-06-05T14:25:48.807
59259
2018-06-05T14:25:48.807
59253
answer