Premise:
"i teach but i teach for Dallas"
Hypothesis: I am a teacher in Dallas.

yes

Premise:
"In this case, more space would be needed for the PJFF."
Hypothesis: There isn't enough space for the PJFF.

yes

Premise:
"I have a good friend of the opposite sex who I've known for three years."
Hypothesis: I do not have any friends of the opposite sex.
no