Breakdown of Sie brauchen keine Sanktionen vonseiten der Lehrer zu erwarten.
Sie
you (formal)
kein
no, not any
brauchen
to need
der Lehrer
the teacher
zu
to (infinitive marker)
der
who, which, that (relative pronoun; die, das)
erwarten
to expect
vonseiten
on the part of
die Sanktion
the sanction
Questions & Answers about Sie brauchen keine Sanktionen vonseiten der Lehrer zu erwarten.
How does vonseiten work in this sentence, and what case does it trigger?
vonseiten is a formal preposition meaning "on the part of" or "from". It always requires the genitive case, which is why it is followed by the genitive phrase der Lehrer.
Could I use seitens instead of vonseiten here?
Absolutely. seitens and vonseiten are completely interchangeable synonyms. Both take the genitive case, so you could just as correctly say ...seitens der Lehrer zu erwarten.
Why is it der Lehrer? Is that singular or plural?
It is plural here. Because vonseiten forces the genitive case, der Lehrer is the genitive plural of die Lehrer (the teachers). If we were talking about just one male teacher, it would be the genitive singular des Lehrers. If we used a standard dative preposition like von ("from"), it would be von den Lehrern.
Why is there a zu before erwarten? Doesn't brauchen act like a modal verb here?
When brauchen is combined with a negative word (like keine or nicht) to mean "do not need to", it acts as a substitute for nicht müssen. However, unlike true modal verbs (which connect directly to a plain infinitive), brauchen still strictly requires zu before the infinitive at the end of the sentence (zu erwarten).
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