Premise:
"But it is too late."
Hypothesis: It isn't too late.

no

Premise:
"to my aunt's cleaning woman in upstate Pennsylvania and learned to adore the small town with its rows of stores and trees on the sidewalk and only a short walk into the country, in this case up a steep hill,"
Hypothesis: Learned to hate the small town with its car dealerships and bushes on the streets.

no

Premise:
"In the background, a tuba started playing."
Hypothesis: An instrument was playing in the background.
yes