Кров червона.

In Ukrainian, the verb to be is usually not expressed in the present tense in simple statements.

So:

• Кров червона. = Blood is red.

This is completely normal Ukrainian.
If you translate word-for-word, it is closer to Blood red, but the meaning is Blood is red.

Because червона is a feminine singular adjective form.

The noun кров is feminine, so the adjective must agree with it in:

• gender
• number
• usually case

Here the adjective is agreeing with a feminine singular noun, so you get:

• masculine: червоний
• feminine: червона
• neuter: червоне

So червона matches кров.

Good question. In Ukrainian, not all feminine nouns end in -а or -я.

Кров is a feminine noun of the third declension. Many nouns in this group end in a soft sign in the dictionary form, for example:

• кров
• ніч
• любов
• сіль

So even though кров does not look like a typical -а feminine noun, it is still grammatically feminine.

Both words are in the nominative singular.

• кров = nominative singular
• червона = nominative singular feminine

This is the normal form for a simple statement like X is Y.

Yes, you can say Червона кров, but it usually means red blood as a noun phrase, not a full statement.

Compare:

• Кров червона. = Blood is red.
• червона кров = red blood

So the position changes the function:

• noun + adjective can make a full sentence here
• adjective + noun usually makes a descriptive phrase

Yes. It is a complete sentence.

Even though there is no written word for is, Ukrainian allows this in the present tense, so the sentence is complete and natural.

A simple approximation is:

• Кров ≈ krov
• червона ≈ cher-VO-na

A few pronunciation notes:

• ч sounds like ch in church
• в is like English v
• р is a rolled or tapped r
• Кров is one syllable

So the whole sentence is roughly:

krov cher-VO-na

Ukrainian has no articles like English a/an or the.

So Кров червона does not need any extra word for the blood or blood.
The exact sense depends on context.

Sometimes, yes, but the most neutral order here is:

• Кров червона.

Ukrainian word order is more flexible than English, but changing it can affect emphasis or make it sound more literary, poetic, or contrastive.

For example:

• Кров червона. = neutral statement
• Червона кров. = usually a phrase, red blood, not the same kind of sentence

So for a beginner, Кров червона is the safest pattern.

You simply add не before the adjective:

• Кров не червона. = Blood is not red.

This is the normal way to negate this kind of sentence in Ukrainian.