У неї висока температура, тому вона п’є багато води.

She has a high temperature, so she drinks a lot of water.

Breakdown of У неї висока температура, тому вона п’є багато води.

• пити: to drink
• вода: the water
• у: in
• вона: she

Questions & Answers about У неї висока температура, тому вона п’є багато води.

Why does the sentence start with У неї to mean “she has”? Can’t I just say Вона має?

Ukrainian commonly expresses possession with the pattern у/в + Genitive + (є) + noun, literally “at/with someone there is.” So У неї висока температура = “She has a high fever.”
You can say Вона має високу температуру, and it’s correct, but мати (“to have”) sounds more formal/bookish or emphatic in many contexts. The у неї… construction is the most natural, everyday way to say “she has.”

What case is неї, and why not її?

Неї is the Genitive form of “she,” used after a preposition. With possession via у/в, you must use the Genitive: у неї (“at her”).
Її is used:

• as a possessive adjective: її книга (her book)
• and as a direct object without a preposition: Я бачу її (I see her)
  After a preposition, use the “stressed” forms: у мене, у тебе, у нього, у неї, у нас, у вас, у них.

Why is there no є after у неї?

In present‑tense existential statements, є (“there is/are”) is often omitted: У неї висока температура.
Include є for emphasis/contrast or clarity: У неї є висока температура, а у нього — ні (She has a high fever, and he doesn’t).