Generalizing: 凡是…都 and 一旦…就

All without exception; as soon as...

凡是…都: everything that...

凡是 (fánshì) sets up an entire category, 都 confirms that no exception escapes the rule.

凡是…，都…

All those who have come here say the scenery is beautiful.

Everything he says, I believe.

一旦 (yídàn) envisions crossing a threshold; 就 links the immediate or irreversible consequence.

一旦…，就…

Once you start, you must not give up.

Once an opportunity is missed, it is rarely had again.

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