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wurde
(auxiliary verb) (dynamic passive) (simple past) (ich / er/sie/es/man)
to be (forms passive voice)
The passive voice is when the recipient of the verb becomes the subject of the sentence. Eg; "John writes the letter"; in this sentence, "John" is the subject, as he is doing the verb "to write". However, if we want to emphasise the letter, rather than John, we can make this sentence passive --> "The letter is written". The passive works similarly in German, and is formed using the verb "werden" and the past participle of the verb, eg; "Der Brief wird geschrieben." (The letter is written) As you can see, the past participle is sent to the end of the sentence.