What is the difference between a strong verb and a weak verb? The distinction is based on how the past tense of the verb is formed.
Weak verbs are pretty straightforward when put into the past tense, usually with the simple addition of –ed, -d or –t to the base form. For example, call/called, wash/washed, carry/carried, cry/cried.
Examples of strong verbs
Strong verbs (also called irregular verbs), form the past tense or the past participle (or both) in various ways, but usually by changing the vowel of the present noun.
dive, dove
stick, stuck
blow, blew
Here are more irregular examples, written below in their base form – past tense – past participle
be – was/were – been
become – became – become
begin – began – begun
bring – brought – brought
come – came – come
do – did – done
eat – ate – eaten
feel – felt – felt
find – found – found
get – got – got (or gotten in American English)
give – gave – given
go – went – gone
grow – grew – grown
hear – heard – heard
keep – kept – kept
know – knew – known