since then
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since then
Expresses that something began at a specific point in the past and has continued or been true since that point. It can introduce a subordinate clause as a conjunction or refer back to a previous sentence as an adverb.
Seitdem er in der neuen Firma arbeitet, ist er viel zufriedener.
Since he started working at the new company, he has been much more satisfied.
'Seitdem' (since then) is a compound of the words 'seit' (since) and 'dem' (that). It literally means 'since that point in time' and always refers to a starting point in the past.
Letztes Jahr war ich in Paris. Seitdem lerne ich Französisch.
I was in Paris last year. Since then, I have been learning French.
'Seitdem' (since then) can introduce a subordinate clause (conjunction) or be part of a main clause (adverb). As a conjunction, it sends the verb to the end of the clause. As an adverb in position 1, it requires the verb in position 2.
Seitdem sie hier wohnt, geht sie oft im Park spazieren.
Since she has been living here, she often goes for walks in the park.
The 'seitdem' clause describes the starting point in the past (usually in the simple past or perfect). The main clause describes the result that continues up to the present (usually in the present tense).
Seitdem er den Kurs gemacht hat, spricht er viel besser Deutsch.
Since he took the course, he speaks German much better.
since
„Seit“ and „seitdem“ refer to a beginning in the past that continues or remains relevant up to the present. „Seit“ normally comes before a stated point in time or introduces a subordinate clause; „seitdem“ can independently refer back to a point in time mentioned earlier. Use „seitdem“ when that point in time is already known.
Wir sind im Mai umgezogen und fahren seitdem jeden Morgen mit dem Bus.
We moved in May and have taken the bus every morning since then.
Seit dem Umzug in die Stadt fahre ich jeden Morgen mit dem Bus.
Since moving to the city, I take the bus every morning.
