"Have no choice but to" and "can't not"
しかない is the everyday "have no choice but to", and the one to start with. わけにはいかない is for when you could do something, but duty or manners won't let you. The other three belong mostly to writing, careful speech and the news.
| Form | What it says | Where |
|---|---|---|
| しかない | Every other option is gone: "I'll just have to" | Everyday |
| わけにはいかない | Duty or manners rules it out: "I can't very well" | Everyday |
| ないわけにはいかない | "I can't very well not", so you do it | Everyday |
| よりほかない, より仕方がない | The same as しかない | Editorials, reports, essays, speeches |
| ざるを得ない | Circumstances force it, and you would rather not | News, reports, careful speech |
| を余儀なくされる | "Be forced to", after a noun | News, company statements, announcements |
しかない: the only thing left to do
Full pageしかないN3
しかない follows a verb in the dictionary form, and that verb is the one thing left to do. Something has ruled out the rest: no trains, no time, nobody else. The feeling is either giving in or steeling yourself: やるしかない, "I've just got to do it". しかたない or しょうがない, "it can't be helped", often comes first.
The last train has already left, so we have no choice but to take a taxi home.
Oh well. We'll just have to walk.
If no one else will take it on, I'll just have to do it myself.
After a noun or an amount, しかない is plain "only": that is all there is.
I only have one thousand yen in my wallet.
わけにはいかない: you could, but you can't very well
Full pageわけにはいかないN3
With わけにはいかない, what stops you is your job, a promise, good manners or what people would think. It is mostly said about yourself. English "can't" also covers what you are unable to do. わけにはいかない never does.
I can't drink alcohol.
Your body can't take it. There is no choice to make.
I drove here today, so I can't very well drink.
You could, and you might like to. Driving home is what stops you.
The plain "can't" is said here too: 今日は車なので、飲めません.
I'll get this today.
No, I couldn't let you do that. I'll pay my share.
そういうわけにはいきません politely turns down an offer, or a chance to get out of something.
ないわけにはいかない: can't very well not
A negative verb in front reverses わけにはいかない: now you can't very well leave the thing undone, so you do it, often without wanting to.
I have an important meeting first thing tomorrow, so I can't very well go to tonight's drinks.
Going is ruled out.
The department head invited me, so I can't very well not go to tonight's drinks.
Not going is ruled out. You go.
なければならない, ないわけにはいかない or しかない?
English "have to" covers all three. Each can be said about the same meeting.
Everyone has to attend tomorrow's meeting.
The plain "must": a rule or a need, nothing more.
Since I made a promise, I can't very well skip tomorrow's meeting.
You have other options, but duty or what people would think rules them out.
There is no one to go in my place, so I'll just have to attend tomorrow's meeting myself.
Every other option is gone.
Where it goes wrong
A negative verb can go before わけにはいかない, but the verb before しかない stays positive.
Not said: 今日は
(I have no choice but not to go today.)
What people say: 行くのをやめるしかない, or あきらめるしかない, "I'll just have to give up".
よりほかない, より仕方がない: しかない in writing
Full pageよりほかない・
よりほかない and より仕方がない mean the same, and both are しかない for writing and careful speech. They state a conclusion you have reasoned your way to. よりほかない can lose its より, and ほかない is common in news and essays.
Until the weather improves, there is nothing to do but wait here.
Having come this far, all we can do now is wait for the result.
ざるを得ない: pushed into it
Full pageざるを得ないN2
ざるを得ない says circumstances leave no way out, so you do it, though you would rather not. Word for word it is "can't manage not to": two negatives, so the thing does get done. する becomes せざるを得ない. Friends usually say しかない instead.
For family reasons, I had no choice but to leave the company I had worked at for many years.
It is also how people accept a conclusion the facts force on them: 認めざるを得ない, "I have to admit".
I have to say that the response this time was too slow.
と言わざるを得ない is how commentators and officials deliver a hard verdict.
やむを得ない・やむを得ずN2Written, formal
やむを得ない is "unavoidable". やむを得ず, "having no choice", is a word of its own: it goes in front of an ordinary verb, where ざるを得ない is built onto the verb.
With the budget cut, we had no choice but to scale back the plan.
しかない, よりほかない or ざるを得ない?
Each can be said about scaling back a plan.
If we cannot increase the budget, we will have to scale back the plan.
The everyday way to say it.
Since we cannot get financial support, there is nothing for it but to scale back the plan.
For writing and careful speech. The weight is on the options running out.
With the budget cut, we have no choice but to scale back the plan.
For writing and careful speech too. The weight is on being pushed into it.
を余儀なくされる: forced to, in the news
Full pageを余儀なくされる・
を余儀なくされる follows a noun, not a verb. The noun is the action, like 延期 (postponement), or the life someone is left with, like 避難生活 (life as an evacuee).
With the typhoon approaching, the organizers have been forced to postpone the tournament.
Having lost their homes in the earthquake, many people are still forced to live as evacuees.
Because of the budget cut, we were forced to scale back the plan.
In careful speech people say ざるを得なかった, and among friends しかなかった.
About an everyday mishap it comes out as a joke.
Sounds odd: 寝坊して、
Having overslept, I was forced to commute by taxi.
Plainly: タクシーで行くしかなかった.
Other kinds of "can't help" and "forced to"
ずにはいられないN2
"Can't help doing": a feeling does the pushing, not a rule or the situation.
When I saw that photo, I couldn't help laughing.
させられるN4
The everyday "be made to": usually by a person, and usually a grumble.
When I was a child, my mother made me eat vegetables I disliked.
羽目になるN1
"Ended up having to": how people talk about their own bad luck.
The road was closed, so I ended up having to walk an hour to the station.