Sentence examples for even know for sure from inspiring English sources

"I don't even know for sure," Mr. Rodriguez said.

We don't even know for sure how common some species might have been in the past.

As the book ends, we don't even know for sure if he's alive.

We didn't even know for sure where or when he recorded his video, let alone where he is now.

"We don't even know for sure how many lights are involved," she said, "but we think it's somewhere over seven million.

We don't even know for sure that Proxima b is a rocky planet, although researchers think this is likely, judging by other planets orbiting small stars.

At the time, it wasn't even known for sure if the two suspects were, in fact, the Tsarnaev brothers.

I never heard another word about the guy -- I never even knew for sure if the story was true -- but it wasn't hard to imagine.

Nobody even knows for sure how many Roma there are in Serbia, with estimates ranging from 180,000 to 450,000.

There is no past anybody can get to, to alter things or even to know for sure what they were, but there is definitely a future, we are already in it.

Did even her publishers know for sure?