"Are they tall trees?"

Translation: Jsou to vysoké stromy?

[ThomasMcKe411894]

Why use "to" instead of "ty", or is the use in this example minor?

[VladaFu]

This is the very common "jsou to"/"to jsou" pattern. It is always "to" for all genders and numbers.

[J.T.307693]

Can you also say jsou to stromy vysoké?

[VladaFu]

That is very strange, the agreeing modifier (adjective) should come before the modified noun.

In a declaration (here we have a question) one could say:

"Stromy jsou to vysoké."

However, that would put the adjective in the predicate. The trees are tall. Saying that as "Jsou to stromy vysoké." would be unnatural.

[Marko195]

It is not Spanish or Italian. In all Slavic languages the adjective is never used after the noun.

[MatousB]

Can you say, "Are the trees tall?"

[BoneheadBass]

As it is in English, that would be a different sentence: "Jsou ty stromy vysoké?"