1. Expresses regret that something is over and can’t be regained: “despite the fact that, if only.”
Hoka no hito ga yattara, motto hayaku dekita deshō ni.
Despite the fact that it could have been finished much sooner if someone else had done it, [unfortunately that was not the case]. / It could have been finished much sooner if only someone else had done it.
Mō sukoshi matte itara, ame ga yandarō ni.
Despite the factt that if we had waited a little longer, the rain might have stopped [we didn’t wait]. / It only we had waited a little longer, the rain might have let up.