is a commonly used expression in Japanese that is partnered with verbs. It is a combination of しか, the 副助詞（ふくじょし） (adverbial particle), and the い-Adjective
ない. This structure may be translated as ‘to have no choice but (A)’, or ‘there is only (A)’. しかない
regularly emphasizes the point that nothing apart from (A) is possible.
To use しかない
, simply attach it directly to the non-past form of whichever verb you would like to highlight as being the ‘only’ possible action.
If it’s come to this, there is no choice but to call the police.
Since trains won't be coming anymore, there is no choice but to go by car.
Unlike だけ, which implies that one particular option was chosen (out of several), しか always insinuates that (A) is the only option, and therefore will sound much stronger than だけ. Also, as only one option exists, it will often be assumed by the listener that some particular circumstances resulted in (A) being all that can be done.
At this hour, nowhere is open other than Pizza Hut. Now that it’s come to it, there is no choice but to order some pizza, right?
I can't take a day off this month, so I have no choice but to resist going to the concert.
may be used in manga, anime, or other forms of media that use casual language. In these cases, it is not uncommon to see しか abbreviated to っきゃ, resulting in っきゃない. However, this is not a common abbreviation in daily language.
If I can't defeat them using this move, there is no other choice but to use my special move, is there?
An opportunity this perfect will not come around a second time, so I have no other choice but to do it now.