quae surgere rēgna

[ClassicalSoul]

Should the future passive here be plural?

quae surgere rēgna:
What a kingdom will be surged!

Aeneid 4. 47

 

[Bitmap]

Which future passive?

 

[Etaoin Shrdlu]

There is no future passive here. Surgere is a present infinitive that is mandated by the verb cernes.