'Haben' or 'Sein' with the Verb 'Schlafen' in German Past Tense?

'Wachsen' indicates a change of state (to grow) which typically requires 'sein' as the auxiliary verb in past tenses. Hence, 'Sie sind gestern sehr schnell gewachsen' (They grew very quickly yesterday) is the correct sentence. 'Haben' could be used with 'wachsen' in certain dialects or colloquial usage, but is generally considered less standard. Mastering the appropriate usage of 'haben' and 'sein' enhances the precision of expressing states and actions in the German language.

• Auxiliary Verbs

When using the verb 'fahren' in the German past tense, 'sein' is the correct auxiliary verb to indicate movement or travel, such as in 'Ich bin nach Berlin gefahren' which means 'I traveled to Berlin'. The choice of 'sein' over 'haben' is pivotal in such contexts because 'fahren' is an intransitive verb that implies a change of location, a state where 'sein' is appropriate to express the action. However, in the sentence 'Ich habe das Auto gefahren' ('I have driven the car'), it uses 'haben' because it emphasizes the action of driving a specific object – the car. Understanding the nuances of 'haben' and 'sein' helps in accurately conveying past actions and is essential for fluency in German.

• Auxiliary Verbs