Premise:
"Even now ads for stocks are tagged for information purposes only, i.e., this ad is not an It's Rene Magritte."
Hypothesis: Ads for stocks are only tagged for informational purposes.

yes

Premise:
"At the MGM Grand Adventure Theme Park (Tel. 702/891-7777; open spring and summer only), visitors can raft a small river, take a 200-ft (61-m) freefall from the Sky Screamer, watch a colorful sea battle, or chat with strolling MGM characters."
Hypothesis: The theme park also has nine roller coasters.

it is not possible to tell

Premise:
"'I have been for some time."
Hypothesis: I have never been here.
no