If A addresses to B an imperative specifying an action X at time TI, and B believes that A believes that
la. X should be done (for a purpose Y) [need for the action]
b. B would not do X in the absence of the request [need for the request]
2. B has the ability to do X (with an instrument Z)
3. B has the obligation to do X or is willing to do it 3
4. A has the right to tell B to do X,