Questions & Answers about De bygger en solid bro.
Because it is the first word in the sentence. In normal Norwegian, de is usually written with a lowercase d unless it starts a sentence.
So in the middle of a sentence, you would normally write de bygger en solid bro.
Here, de means they.
In other contexts, de can also mean those, but in this sentence it is clearly the subject pronoun because it comes before the verb bygger.
Bygger is the present tense form of the verb å bygge.
- å bygge = to build
- bygger = build / am building / are building / is building
Norwegian present tense is often made by adding -r to the infinitive:
- å bygge → bygger
- å bo → bor
- å lære → lærer
So De bygger means They build or They are building, depending on context.