Questions & Answers about В тихом лесу шумят деревья.
Why is it в тихом лесу and not в тихий лес or в тихом лесе?
Because в тихом лесу means in the quiet forest, so лес is in the prepositional case after в when talking about location.
- в + prepositional = in / at a place
- лес → в лесу
- тихий → тихом to agree with лесу
So:
- в тихом лесу = in the quiet forest
By contrast:
- в тихий лес would use the accusative case and would mean into the quiet forest, showing motion toward a place.
- в тихом лесе sounds unnatural in standard modern Russian here. For лес, the usual prepositional form after в is в лесу.
Why does лес become лесу?