You are provided with an "Event" and it's "Intent" related to PersonX. Determine the sentiment value of the given input as either "Positive", "Negative", and "Unknown". 

Event:PersonX prevents ___ from obtaining. Intent:
Negative

Event:PersonX buys ___ at the price. Intent: 1) to move out from his parent's home.
Negative

Event:PersonX inhibits ___ in vitro. Intent: 1) this is not a rule for people

Positive