Questions & Answers about Из чайника льётся горячая вода.
Because из means out of / from, and it requires the genitive case in Russian.
- dictionary form: чайник = kettle, teapot
- genitive singular: чайника
So:
- из чайника = out of the kettle
This is a very common pattern:
- из дома = out of the house
- из машины = out of the car
- из бутылки = out of the bottle
Because вода is the subject of the sentence: it is the thing that is flowing/pouring.
Russian word order is much freer than English word order. In English, the subject usually has to come before the verb:
- Hot water is pouring from the kettle.
In Russian, the subject can come after the verb without changing its grammatical role:
- Из чайника льётся горячая вода.
Here, горячая вода is still the subject, so it stays in the nominative case.