What is the most irregular verb in English?

It's impossible to definitively say which verb is the "most" irregular in English, as irregularity is subjective and depends on how you define it. However, some strong contenders for the title of most irregular verb include:

* Go - This verb has the most drastically different forms: go, went, gone.

* Be - This verb has a large number of forms (am, is, are, was, were, been), and its past participle is also the present participle.

* Have - This verb also has a high number of forms (have, has, had) and its past participle is also the present participle.

Ultimately, the "most irregular" verb is a matter of opinion and depends on your criteria for irregularity.