Questions & Answers about Тебе нужно беречь своё здоровье.
Why is тебе in the dative case?
Because in Russian you express “need” with a dative‑case person plus an impersonal predicate. Literally, тебе нужно means “to you it is necessary…,” so the one who needs something is in dative.
What part of speech is нужно and how does it work here?
Нужно is a neuter short form of the adjective нужный, used impersonally as “it is necessary.” It doesn’t agree with тебе (dative) but forms a fixed structure кому нужно + infinitive.
Why is беречь in the infinitive form?
After modal predicates like нужно, you always use an infinitive to express the action that’s necessary. So you say нужно + беречь, not a finite verb form.
What case is здоровье in, and how can I tell?
Here здоровье is the direct object of беречь and thus in the accusative. It happens to look like the nominative because it’s a neuter noun whose nominative and accusative forms coincide.
Why is своё used instead of твоё?