черную

черную

"Черную" means "black" (feminine accusative singular form).

In this sentence, 'черную' is the feminine accusative form of the adjective 'черный', agreeing in gender, number, and case with 'рубашку' (shirt), which is feminine singular in the accusative case.

Я купил черную рубашку.

I bought a black shirt.

Here, 'черную' again modifies a feminine noun, 'сумку', indicating its color and matching its accusative case form.

Она потеряла черную сумку.

She lost her black bag.

This sentence demonstrates 'черную' describing 'тень' (shadow). 'Тень' is a feminine noun undergoing an action, reflected in the adjective form.

В комнате была черную тень.

There was a black shadow in the room.