Why is the verb fly not spelled flied in past tense?

The verb "fly" is irregular, meaning it doesn't follow the standard rules of past tense formation by adding "-ed." Here's why:

* Old English Roots: The word "fly" comes from Old English "fleogan," which already had a distinct past tense form, "fleow." Over time, this evolved into the modern "flew."

* Historical Sound Changes: English has undergone significant sound changes throughout its history. The "ow" sound in "fleow" shifted to the "ew" sound in "flew."

* Irregular Verbs: Many common verbs in English have irregular past tense forms. These verbs are remnants of the language's history and have become entrenched in usage. Examples include:

* go -> went

* see -> saw

* eat -> ate

So, "flied" is not the correct past tense of "fly" because it is an irregular verb with a unique past tense form.