can learn or can know

[joham]

We can learn from this that history does not predict the future. Please can we say "We can know from this that history does not predict the future"?

 

[Rover_KE]

Source and author, please.

 

[joham]

I came across this problem from someone's homework of comprehension :
From the passage we can know that a restroom is _________.
A. a place to rest B. a public bathroom C. a place to have a bath D. an airport service center

I just suspect that in this problem "can learn" should have been used instead of "can know". Am I right or wrong? Or both phrases are all right?

 

[emsr2d2]

I don't find "can know" or "can learn" natural. I wouldn't use "can" at all. I'd say "From the passage, we know that a restroom is ...". If I had to use "can", I'd follow it with something like "assert" or "say with confidence".