Premise:
"Imagine that."
Hypothesis: Picture it.

yes

Premise:
"Some of the stands under the bright umbrellas are real herbalists' heavens, but even if you can understand the patois, it's difficult to learn the precise uses for certain mysterious-looking items."
Hypothesis: There are mysterious-looking items, whose use if difficult to ascertain.

yes

Premise:
"yes right well one of the nicer restaurants supposedly that opened up here not uh too very long ago called Harbor Lights specializes in fish"
Hypothesis: Harbor Lights is a nice seafood restaurant that recently opened up here.
yes