"wouldn't" has a nuance of somebody trying to open the door and being unable. "didn't" can be used more generally.
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voynichSo "Then why wouldn't the tree collapse?" goes for the same? Does it have a nuance of somebody trying to collapse the tree?The idea of someone "collapsing a tree" is odd. It may imply that the tree was expected to collapse of its own accord, but possibly as a result of someone's actions.
voynichThen why wouldn't the tree collapse?"tree" and "collapse" don't go together. You'd do better to use "building" instead of "tree".
To my ear, the first of these expresses more puzzlement that the building did not collapse as expected.
voynichCould you tell me whyNo, I'm afraid not. It's just a property of the word "would". In this case, the way I'm reading it, the building was supposed to collapse but it didn't. "Why wouldn't ...?" shows that the speaker was expecting something to happen and it didn't.doesthis sort of difference occurs?
"He said that he was gonna come here but he didn't. Why wouldn't/didn't he come?"
"Why wouldn't ...?" shows that the speaker was expecting something to happen and it didn't.
voynich"He said that he was gonna come here but he didn't. Why wouldn't/didn't he come?"Then in the above sentence, "wouldn't" sounds more natural to your ears due to his statement than "he was gonna come"?"wouldn't" with people is different from "wouldn't" with inanimate objects because people have a will or volition. "Why wouldn't he come?" usually has an i
voynich"He said that he was gonna come here but he didn't. Why wouldn't/didn't he come?"Then in the above sentence, "wouldn't" sounds more natural to your ears due to his statement than "he was gonna come"?To me they are both natural enough, but they are asking slightly different things.