Prepositions introducing conditional meanings
Q1. ___ your approval, we will proceed
WITH indicates condition. Approval enables action. Proceeding commences.
Q2. ___ your help, I cannot succeed
WITHOUT introduces negative condition. Help is required. Success is contingent.
Q3. ___ an emergency, break the glass
IN AN EMERGENCY is a conditional phrase. Glass awaits breaking. Emergencies are hoped against.
Q4. ___ arrival, please register at reception
ON ARRIVAL means when you arrive. Registration is required. Reception awaits.
Q5. ___ no circumstances should you open this door
UNDER NO CIRCUMSTANCES is a strong negative condition. Doors remain closed. Curiosity is tested.