"The Dutch buildings are tall and pretty."

Translation: A holland épületek magasak és szépek.

[deactivated user]

Why is "holland" not plural?

[mizinamo]

Because it's right before the noun (an attributive adjective).

Only predicative adjectives, or attributive adjectives without a noun (szépek "pretty ones"), get pluralised.

[Gabriella324526]

Could you please explain why it is not possible to say ' magas és szép' ?

[AGreatUserName]

Because these are predicate adjectives. The subject is plural, so these must be plural too.

Az épület magas és szép. = The building is tall and pretty.
Az épületek magasak és szépek. = The buildings are tall and pretty.

[Xenocider]

Only if you use a simple plural form without any measurement. If you say "the buildings are tall" it's "az épületek magasak" (plural for both the subject and the adjective), but when you mention or imply the amount of them then both will lose the plural form, as in "Those three buildings are red" will be "Az a három épület piros", (instead of "Az a három épületek pirosak") or "Many buildings are red" becomes "Sok épület piros".

[KathyLudan]

Would 'csinos' not work for 'pretty'? Or is that only used for people?

[gabika51254]

Csinos.ak = pretty

[Richi946080]

a holland épületek magasak és csinosak.
This should be accepted. The hints even give "csinosak" as correct.

[jzsuzsi]

You do not call a building csinos. That's only for people (or clothes)

[Richi946080]

Köszönöm