The text on some occupation cards starts with "whenever," which clearly means it could occur multiple times. But what about occupation cards that start with "if"? For example, the NET FISHERMAN says "If one of your people . . ." Can this card only be used once (because it doesn't say "whenever") or can it be used multiple times throughout the game?
the difference is this...
usually an If card (if one of you people gathers wood)
Then this action is only done on your turn.
but a when card... (whenever you bake bread)
sometimes you can do that on someone elses turn... like if you have a card that lets you bake bread if someone else does...