しかない
- 1Verb + しかない: there is no alternative but to do the action; one must do it.Ex. 1
- 2Noun + しかない: there is only this one thing and nothing else.Ex. 2
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Common in both conversation and writing to express resignation or determination when circumstances leave only one course of action. It works equally for unwelcome necessities and for resolve (やるしかない, "we just have to do it"). It is more everyday than ほかない and よりほかない, and less stiff than ざるを得ない.
Do not put the verb in the ない-form before しかない; say 帰るしかない, not 帰らないしかない.
Note that しか always requires a negative ending; しかある is ungrammatical.
Learners should not swap in だけ freely, because しかない stresses a lack of alternatives while だけ simply limits.
- 〜ほかないN3「〜ほかない」matches only the verb-attached use of「しかない」; the meaning is basically the same and the two are interchangeable, but it sounds more formal and bookish. It cannot attach directly to a noun — you cannot say「これほかない」.
- よりほかないN2「よりほかない」matches only the verb-attached 'can only' use of「しかない」, and the two are interchangeable, though it sounds more formal and bookish. It cannot attach to a noun to mean 'only have,' and it can also follow the verb ない-form, as in「断らないよりほかない」.
- 〜しか〜ないN4「〜しか〜ない」is the broader restriction structure: various negative predicates can follow「しか」(e.g., 「水しか飲まない」), and it can also follow particles (e.g., 「ここでしか買えない」). The 'have no choice but to' reading of 'verb dictionary form + しかない' is identical in both and interchangeable.
- ざるを得ないN2「ざるを得ない」matches only the verb-attached 'can only...' use of「しかない」; it attaches to the verb ない-form minus「ない」(する→せざる) and sounds stiff and bookish. It cannot replace「しかない」when that attaches to a noun to mean 'only have...'.
- わけにはいかないN3「わけにはいかない」means you cannot do something because of propriety or your circumstances; only its negative form「ないわけにはいかない」comes close to the 'can only' of「しかない」, but it stresses acting out of duty or moral obligation rather than having no other option. It does not attach to nouns.
〜ほかない and よりほかない carry the same "no choice but" meaning but sound more formal or written, and ざるを得ない (attached to the 未然形) stresses acting reluctantly against one's will. In contrast, わけにはいかない means one cannot do something for social or moral reasons, and 〜しか〜ない is the general "only" construction used with any negative predicate (e.g. 水しか飲まない).
