
sonst
otherwise
Introduces a consequence that will occur if a condition is not met. It means 'andernfalls' (otherwise).
Du musst dich beeilen, sonst verpasst du den Bus.
You have to hurry, otherwise you'll miss the bus.
otherwise / else
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otherwise
Introduces a consequence that will occur if a condition is not met. It means 'andernfalls' (otherwise).
Du musst dich beeilen, sonst verpasst du den Bus.
You have to hurry, otherwise you'll miss the bus.

otherwise / usually
Refers to other times or circumstances and means 'normalerweise' (normally) or 'üblicherweise' (usually).
Heute bin ich etwas müde, aber sonst geht es mir gut.
I'm a bit tired today, but otherwise I'm doing well.

else
Used in questions to ask about additional things or information. It means 'außerdem' (in addition) or 'weiterhin' (furthermore).
Möchten Sie sonst noch etwas bestellen?
Would you like to order anything else?

who/what/where else
Used to emphasize that no other person, thing, or place is possible.
Wer sonst als du hätte das wissen können?
Who else but you could have known that?
You can recognize the meaning of 'sonst' from the sentence structure. At the beginning of a sentence with the verb in position 2, it means 'otherwise'. In a question, it means 'else' or 'in addition'. After a question word like 'wer' (who) or 'was' (what), it emphasizes that there is no other logical possibility.
Du musst jetzt lernen, sonst schaffst du die Prüfung nicht.
You have to study now, otherwise you won't pass the exam.
When 'sonst' introduces a consequence (otherwise), it often appears as an adverb in position 1 of the sentence. The conjugated verb then moves to position 2, directly after 'sonst'.
Zieh eine Jacke an, sonst erkältest du dich.
Put on a jacket, otherwise you'll catch a cold.
In the meaning of 'normally' or 'usually', 'sonst' often appears in the middle of the sentence to create a contrast between the normal state and a current, different situation.
Heute habe ich ein bisschen Kopfschmerzen, aber sonst bin ich fit.
Today I have a bit of a headache, but otherwise I'm fit.
The question 'Sonst noch etwas?' (Anything else?) is a very common and polite phrase in service situations, for example in a restaurant or shop. It means 'Would you like to order or buy anything else?'.
Das macht dann 5,50 Euro. Darf es sonst noch etwas sein?
That comes to 5.50 euros. Would you like anything else?
In combination with a question word like 'wer' (who), 'was' (what), or 'wo' (where), 'sonst' expresses that the answer to the question is obvious and that there is no other logical alternative.
Natürlich hat er das gewusst. Wer sonst hätte die Antwort kennen sollen?
Of course he knew that. Who else would have known the answer?
different / differently
„Sonst“ in „wer sonst?“ asks about another possibility and often emphasizes that no one else is being considered. „Anders“, by contrast, describes a person or possibility as different. Use „sonst“ when highlighting the only obvious choice, and „anders“ when asking about a different choice.

Wer sonst könnte uns bei diesem Problem helfen?
Who else could help us with this problem?
Wer anders könnte uns bei diesem Problem helfen?
Who could help us with this problem instead?