The least you could have done was to ask her out.
The least you could have done was to have asked her out.
Aren't these practically interchangeable?
Whether there are grammatical reasons to favour one over the other, I'm unsure of. What I can tell you, is that in general English conversation both are accepted and suggest the same meaning. So yes, they are certainly interchangeable in a practical sense.
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Whether there are grammatical reasons to favour one over the other, I'm unsure of. What I can tell you, is that in general English conversation both are accepted and suggest the same meaning. So yes, they are certainly interchangeable in a practical sense.