Premise: For an alien in one of the unrestricted categories representation would be authorized so long as the eligible alien is present sufficient to maintain residence or lawful immigration status.

Hypothesis: Aliens in the unrestricted categories are never allowed representation.
Answer: no

Premise: Teenagers might like to join the open-air disco hordes at Harajuku, near Yoyogi Park.

Hypothesis: The disco is a popular hangout for local teens.
Answer: it is not possible to tell

Premise: It's also important to take the rarefied atmosphere into account when exercising.

Hypothesis: The oxygen concentration has no effect on exercising.
Answer: no

Premise: I shall stick to the old ship, I think, though it's awfully good of Hersheimmer.

Hypothesis: I shall get rid of the old ship and start using a new one.
Answer: no