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Questions & Answers about Hij is hier geboren en volwassen geworden.
Why does the sentence use is (present tense auxiliary) when the English translation says "was born" (past tense)?
In Dutch, you usually use the present perfect (is geboren) for someone who is still alive, treating their birth as an event that has a current result. If the person has passed away, or if you are telling a strictly historical narrative, you would use the simple past: werd geboren.
Why is there only one auxiliary verb (is) for both parts of the sentence?
To avoid repetition! Because both clauses share the same subject (hij) and the exact same auxiliary verb (is), they can be dropped after the conjunction en. The full, unshortened thought would be: Hij is hier geboren en [hij is] volwassen geworden.
Why does geworden take is as its auxiliary verb instead of heeft?
The translation says "became an adult", but where is the word for "an"?
Volwassen is actually an adjective in Dutch, meaning "adult", "mature", or "grown-up". While English often uses a noun phrase ("became an adult"), Dutch prefers the adjective. Therefore, volwassen worden literally means "to become adult/mature", which is the standard way to express growing up.