The contraction "won't" is in my opinion a strange word in English, and its formation doesn't follow the typical rules for contractions. Here's a breakdown of why it's "won't" and not "willn't":
Historical Development: The word "won't" actually comes from an older English form: "will not" became "will not" then "wonnot" and then "won't" over time. In Middle English, the word for "will not" was often written as "wilnot" or "will not," and the "l" sound in "will" was dropped in the contraction, leading to the form "won't."
Irregularity in English: English has several irregular contractions where the form doesn’t follow a simple "verb + not" pattern. For example, "cannot" becomes "can't," and "will not" becomes "won't." These irregular contractions evolved due to pronunciation and linguistic changes over time.
Linguistic Evolution: The language evolved so it was easier and more natural to say "won't" rather than "willn't," with the "l" sound in "will" getting absorbed into the contraction. This happened similarly to how "shall not" became "shan't" in British English, though that's not commonly used in American English.
In short, "won't" is just the result of how the English language evolved historically, and there isn't a clear linguistic reason for why it's not "willn't." It’s simply one of those quirks that makes English a bit tricky!
