Haben vs. sein in the Perfekt
Ich habe nach Berlin gefahren.
Ich bin nach Berlin gefahren.
Verbs of motion and change of state form the perfect with sein.
German word order and case endings are the kind of thing you only learn by producing sentences and being corrected. FluenText does that inside a normal chat: you text a friend or an AI practice partner in German, and each message comes back with the case, ending or verb position you missed.
The errors that survive years of study, because nobody in a real conversation stops to correct them.
Ich habe nach Berlin gefahren.
Ich bin nach Berlin gefahren.
Verbs of motion and change of state form the perfect with sein.
mit der Freund
mit dem Freund
Mit, nach, bei, seit, von, zu and aus always take the dative.
ein gut Freund
ein guter Freund
The ending depends on gender, case and which article came first.
Herr Weber, kannst du mir helfen?
Herr Weber, können Sie mir helfen?
Surname plus title means Sie, and the verb form has to follow.
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