"The car is blue."

Translation: To auto má modrou barvu.

[GogaTuman]

In english it should be "The car has blue color" -_-

[BoneheadBass]

That is a very literal rendering of the Czech sentence, but it is not a good translation to English.

[RunningStudent]

When is it necessary to mention barvu and when not?

[AgnusOinas]

It's necessary here, otherwise "the car has a blue... what?"

• Auto je modré.
• Auto má modrou barvu.
• (X) Auto má modrou. - makes no sense, unless it's a follow-up sentence, e.g. "Dům má bílou barvu, auto (má) modrou."

"barva" is optional in situations such as these:

• Mám rád modrou (barvu). - I like blue (the color blue).
• Líbí se mi modrá (barva). - I like blue (the color blue).
• Podej mi modrou (barvu). - Pass me the blue paint.

[Durple_Purple]

Is "je modré" possible?

[BoneheadBass]

"To auto je modré" is also accepted.

[GinaHearn4]

Is that not the more usual way of saying it?

[VladaFu]

Both are common.

[Pollyhs]

why modrou and not modre. it is to auto neuter. isn't it?

[VladaFu]

The adjective modrý modifies barva, which is feminine, it does not modify auto.

[RunningStudent]

"Ten" auto má modrou barvu is not correct?

[BoneheadBass]

It is not. Auto is neuter, so you need to. But if you use automobil, which is masculine inanimate, then ten works.