==> "He leaped to the window sill" vs "He had leapt to the window sill." (present vs. past)
I question that "He leaped to the window sill" is present tense.
I think the two are interchangeable, but I prefer the inflected forms leapt and learned.
There are a whole host of verbs, besides just leap and learn, that have that have both regular ('ed') and irregular ('t') past tenses. As I mentally go through the list, I'm not sure there is a pattern, other than it's what I'm used to hearing and saying. That directly supports the notion that it's a regional preference.
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