Why are irregular verbs important?

Regular verbs conform to a standard pattern see this table
Irregular verbs like to go do not. So if you know the verb forms of to walk for example - I walk/We walked etc - you have the key to the most English verbs. 

In contrast to go has verb forms not replicated elsewhere: I go/he went etc. For second language learners this means they must be memorised rather than learned by a standard rule

There are around 180 irregular verbs in English . These are vastly outnumbered by the thousands of standard ones. 

Patterns

The inflection pattern of regular verbs is so instinctive that young children and English language learners often regularize irregulars: I knowed that. 



Though only a tiny fraction of the verbs available, irregulars make up 70% of the verbs in everyday use.

So how have these tricky customers evolved? And why are they so central to English?