Questions & Answers about Його щока червона.
In Ukrainian, the present tense of to be is usually omitted.
So Його щока червона literally looks like His cheek red, but it naturally means His cheek is red.
You may see є in some contexts, but in everyday speech it is normally left out here.
Here його means his.
It comes from the pronoun він = he, and before a noun it often works as a possessive:
- його щока = his cheek
- його рука = his hand
By itself, його can also mean him in some contexts, but in this sentence, because it comes directly before a noun, it is understood as his.
Because щока is a feminine noun, and the adjective has to agree with it.
So:
- masculine: червоний
- feminine: червона
- neuter: червоне
- plural: червоні
Since щока is feminine singular, the correct form is червона.