Breakdown of Við styðjum grannavörsluna og nágrannarnir gera það líka.
og
and
það
it / there (existential) / the one (n)
við
we
gera
to do / to make (something) + adjective
Questions & Answers about Við styðjum grannavörsluna og nágrannarnir gera það líka.
How does the phrase gera það replace the verb here?
Gera það literally means "do it" but translates to "do so." It acts as a pro-verb construction that replaces the entire active predicate from the first clause (styðjum grannavörsluna) to avoid repetition.
Since styðja takes an accusative object, does það take its case from styðja?
No, það is in the accusative case because it is the direct object of gera (to do), which always governs the accusative. In the gera það construction, the case governed by the original replaced verb does not matter.
Why does the sentence use granna- in the first half but nágrannarnir in the second?
Both come from the same root for "neighbor." Nágranni is the standard everyday noun for a neighbor. Granni means the exact same thing but is mostly used today as a prefix in compound words, like grannavarsla (neighborhood watch).
What is the base form of grannavörsluna and why does it take this ending?
The base form is grannavarsla. Here it is in the accusative case because it is the direct object of the verb styðja (to support). The internal -u ending indicates the accusative for this weak feminine noun, and -na is the attached definite article.