Struktur
Verb + べき + だ
Verb + べき + Noun
[い]Adjective + くある + べき + だ
[な]Adjective + である + べき + だ
Noun + である + べき + だ
Exceptions:
する → す(る)べき
Rincian
Standar
Kanji Langka
可き
Tentang べき
The auxiliary verb べき, being the attributive form of べし, is a structure in Japanese that is often paired with verbs to express that something 'ought to be done'. It implies some sort of moral obligation, or that (A) is the only reasonable course of action. This comes from the kanji 可き, which carries the meaning of being something 'permissible' (indicating that any other action would not be acceptable).
べき will be paired with the plain (non-past) form of a verb, before being followed by either だ, or another noun.
べき is also sometimes translated as 'must do (A)', or 'should do (A)' but it is important to remember that it will always have the nuance of being the only 'permissible' choice, and is therefore very strong.
Caution
It is important to note that the verb appearing with べき cannot be in past tense, and you will need to use だった or でした after べき, if you would like to say that something 'ought to have been done' in the past.
Fun Fact
In modern Japanese, there are only 18 auxiliary verbs, of which べき is not one. べし (the standard form) is considered to be a classical auxiliary verb. Due to this, べき (and べし) are often referred to as classical auxiliary verbs.
Fun Fact
The combination of する and べき is a rare grammatical exception in Japanese, in which two forms are both considered equally correct. Due to this, either するべき, or すべき may be used.
Sinonim
Antonim
Terkait
Cakupan Kosakata
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Contoh
--:--
税金を払う可きです。
You should pay taxes.
考える可きことが多すぎて、頭が痛い。
There are too many things I should think about, so my head hurts.
言う可きことを言うのは親の義務だ。
Saying things that you should say is a duty of a parent.
誰も見ていなくても、法律は守る可きだ。
Even when no one is looking, you should obey the law.
明日の会議は重大な話があるので、出席をする可きだ。
Because we will talk about something important at tomorrow's meeting, everyone should attend.
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べき – Diskusi Tata Bahasa
Balasan Terbaru (total 28)

The111
The lesson includes conjugation instructions for adjectives and nouns, but zero examples containing those structures. This is especially bothersome because I don’t even understand logically how the concept of “must” can logically be applied to anything other than a verb.

BreadmanNin
Isn’t ある a verb though? であるべく basically means “should be”. If you think of it that way, I think it makes a lot of sense. For example:
先生は優しい人であるべきと思います。
I think a teacher should be a kind person.
The111
Yes, that is along the lines of the examples the LLM gave me. I’m just pointing out a recurring pattern where the lesson gives e.g. 4 conjugation patterns, and then gives a dozen or more examples that exercise only one of those patterns. I read the intro very meticulously, and then expect to see the things I learned illustrated in the examples, but maybe I’m being unreasonable.