Only 'happen' sounds wrong to me, and only 'unfold' sound like the mot juste.
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Gene93appen sounds odd to me too and I don't know why, to be honest.It does not collocate well, that is all; that is why many vocabulary choices are wrong.
Gene93I am just angry with myself because I often don't know why something is right/wrong.No need to do that; it is just a part of the process of becoming fluent.
Gene93I am surprised that "play out" works here. I have never seen it in such contexts.I have not necessarily done so, either, but it sounds right.