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Seit is a German preposition that indicates the starting point of an action or event and the duration of that action or event up until the present time.
preposition
Meaning: since (point in time)
Ich lerne seit einem Jahr Deutsch.
I have been learning German for a year.
Meaning: for (duration of time)
Ich habe seit einer Stunde auf dich gewartet.
I have been waiting for you for an hour.
Meaning: since (cause)
Seit dem Unfall hat er Angst vor dem Autofahren.
Since the accident, he is afraid of driving a car.
Meaning: from (starting point)
Seit dem Bahnhof sind es noch zehn Minuten zu Fuß.
It's a ten-minute walk from the train station.
A1: Ich lerne seit einem Jahr Deutsch.
I have been learning German for a year.
A1: Wir wohnen seit zwei Monaten in Berlin.
We have been living in Berlin for two months.
A1: Seit gestern regnet es.
It has been raining since yesterday.
B1: Seit ich denken kann, interessiere ich mich für Musik.
I have been interested in music for as long as I can remember.
B1: Sie arbeitet seit fünf Jahren als Lehrerin an dieser Schule.
She has been working as a teacher at this school for five years.
B1: Seitdem er seinen Führerschein hat, fährt er jeden Tag mit dem Auto zur Arbeit.
Since he got his driver's license, he drives to work every day.
C1: Ich habe seit Jahren nicht mehr mit ihm gesprochen.
I haven't spoken to him in years.
C1: Seit Beginn des Jahres hat sich viel verändert.
A lot has changed since the beginning of the year.
C1: Er wird seit Wochen vermisst.
He has been missing for weeks.
The preposition seit is commonly used in German to indicate when an action or event started and how long it has been going on. It is often translated into English as 'since' or 'for'. For example, 'Ich lerne Deutsch seit drei Jahren' means 'I have been learning German for three years'. The word 'seit' indicates the starting point of the action (three years ago) and the duration of that action up until the present time.
It's important to note that seit is always used with a specific point in time or a period of time. This means that it cannot be used to describe ongoing actions without a clear starting point. For example, you cannot say 'Ich arbeite seit' (I have been working since) without specifying when you started working. You would need to say something like 'Ich arbeite seit 2010' (I have been working since 2010).
Another common use of seit is in combination with the conjunction 'dem', which creates the phrase 'seitdem'. This phrase is used to indicate that something has been happening since a certain event occurred. For example, 'Ich habe Kopfschmerzen seitdem ich gestern zu viel getrunken habe' means 'I have had a headache since I drank too much yesterday'. The word 'seitdem' indicates that the headache started after the drinking occurred.