to run along / go along
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to run along
To take part in a running movement, especially in a race, march, or walk together with others.
Beim Stadtmarathon sind dieses Jahr Tausende von Amateuren einfach nur zum Spaß mitgelaufen.
At the city marathon this year, thousands of amateurs ran along just for fun.
'Mitlaufen' (to run along/go along) is a separable verb. The prefix 'mit-' goes at the end in a main clause, while in a subordinate clause and in the infinitive it remains attached to the verb.
Beim Firmenlauf läuft meine ganze Abteilung mit.
At the company run, my whole department is running along.
The verb is made up of 'mit' (with/along) and 'laufen' (to run/walk). In all meanings, the prefix 'mit' carries the idea of 'being together' or 'being simultaneous.'
Sie ist bei der Demonstration einfach nur mitgelaufen.
She was just going along at the demonstration.
Since 'laufen' (to run/walk) expresses movement, the perfect tense of 'mitlaufen' (to run along/go along) is always formed with the auxiliary verb 'sein' (to be), not with 'haben' (to have).
Bist du gestern beim Protestmarsch auch mitgelaufen?
Did you run along in the protest march yesterday too?
You can recognize the technical meaning from words like 'im Hintergrund' (in the background), 'Programm' (program), 'Prozess' (process), or 'Aufnahme' (recording). It describes something that happens in parallel and often unnoticed.
Ich habe die ganze Zeit eine Audioaufnahme mitlaufen lassen.
I had an audio recording running the whole time.
This meaning often has a critical or negative connotation. It is used to describe someone acting passively and without their own conviction, often in connection with 'einfach nur' (simply/just) or 'mit der Mehrheit' (with the majority).
Anstatt eine eigene Position zu vertreten, ist er bei der Entscheidung einfach nur mitgelaufen.
Instead of taking his own position, he simply went along with the decision.
to run
'laufen' and 'mitlaufen' can both describe movement or a running technical process. 'laufen' only says that someone is running/walking or that something is working. 'mitlaufen' additionally means that someone is running or walking together with others, or that something is active at the same time in the background. In a race, walk, or march, 'mitlaufen' is more natural when you mean participation in a group. In technical contexts, you say 'mitlaufen' when a program or recording is active in the background. The risk of confusion lies in the fact that both words contain 'laufen'; however, 'mit-' always shows being part of something or running alongside.
Beim Stadtlauf läuft Yusuf mit seinen Freunden mit.
At the city run, Yusuf runs along with his friends.
Anton ist vor dem Termin noch schnell durch den Park gelaufen.
Before the appointment, Anton quickly ran through the park.