56785
たら is a grammar structure which means if...then.  
But what does たら mean in this sentence?

> この権益の擁護には真剣たらざるを得ない

The sentence means

> We must be serious about defending this interest

What is the role of たら in this sentence?  
It seems that it does not mean if...then here.
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2018-02-21T01:50:49.067
56776
2021-12-20T16:04:13.693
2018-02-22T03:06:09.813
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question
grammar
Use of たら in この権益の擁護には真剣たらざるを得ない
What you see is not the conditional -たら, but
-[たる](https://dictionary.goo.ne.jp/jn/139292/meaning/m0u/) +
[ざるを得ない](https://dictionary.goo.ne.jp/jn/89866/meaning/m0u/).

  * X **たる** ("be X; being X")  
This form is a vestige of an old sibling of what is now called _na-adjective_
, which still occasionally appears in formal speech. It stands particularly
for state that is _acquired_ (instead of _inherent_ ), _temporary_ (↔
_permanent_ ), _apparent_ (↔ _internal_ ), or _due_ (↔ _actually is_ ).

Despite what some dictionaries say, it _does_ conjugate in the same manner as
verbs なる or おわる (consonant-stem; type I) when needed, though most frequently
seen in the dictionary form as an attributive to a noun.

  * **ざるを得ない** ("have no choice but")  
A fixed phrase to learn by rote, but consists of ざる ( _archaic_ "not -ing") +
を (accusative) + 得る ("be able") + ない ("not"). Since it starts with a negative,
words that come before it must be changed into negative form:

> **行か** ざるを得ない  
>  **見** ざるを得ない  
>  **同意せ** ざるを得ない (⚠ _suru verbs have an irregular form!_ )

and

> **真剣たら** ざるを得ない _cannot but assume a serious attitude_
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2018-02-21T11:03:07.017
56785
2021-12-20T16:04:13.693
2021-12-20T16:04:13.693
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answer