What is the french expression for 'who knows' as in 'it is impossible to know or be sure' there is the expression 'va savoir' but what does it mean and how is it generally used?

Answer 1

'who knows?' is best translated by 'qui sait ?' in French. 'va savoir' is more affirmative, it is a statement that no answer can be found. 'va savoir' is a bit outdated, informal and used in spoken French, while 'qui sait' is more formal, and used in both speech and writing.