Sentence examples for it is impossible to know from inspiring English sources

It is impossible to know.

It is impossible to know for sure.

"It is impossible to know how serious.

It is impossible to know how many.

It is impossible to know if this is acknowledged.

But it is impossible to know for sure.

It is impossible to know whether such pledges will hold.

It is impossible to know the real death toll.

With the password changed, it is impossible to know.

But it admits it is impossible to know exactly.

It is impossible to know exactly what happened next.