Just say no: when does the advice fit?

Someone asks you to own a full-day stall. You have a fixed appointment and cannot cover the shift. You cannot responsibly promise the requested time. A clear refusal lets the organiser plan. Change one condition: The organiser asks whether you can hand over a key for five minutes instead. This is a different request. You may offer it if it fits; the smaller offer does not revive the full-day promise.

A friend asks for “a little help” next weekend. You do not yet know the task or duration. You can decline, but a question might reveal an easy bounded request or confirm that it will not fit. Change one condition: They need you to drive for six hours, and you cannot spare the day. The scope is now clear enough for an honest answer.

You already agreed to give a colleague the only key before their shift. You no longer feel like making the trip. A new refusal leaves an existing commitment unresolved. Arrange a workable handover or ask to renegotiate it. Change one condition: The key has been copied and the colleague confirms they no longer need your handover. The dependency has gone. Declining an unnecessary trip does not break the same promise.