Ik heb het boek gelezen.
English: I have read the book.
Irregular verbs in Dutch are verbs that do not follow the regular conjugation patterns. Their forms can change in unpredictable ways in the past tense and past participle.
Use irregular verb forms when talking about actions in the present, past, or when using perfect tenses. Many common Dutch verbs are irregular.
Ik heb het boek gelezen.
English: I have read the book.
Wij gingen naar huis.
English: We went home.
Zij kwam te laat.
English: She came late.
Jullie hebben het gezien.
English: You (plural) have seen it.
Hij schrijft een brief.
English: He writes a letter.