Learn Danish: Drengen spiser tre æbler. - The boy eats three apples.

No, it doesn't! While the number one changes based on gender (en vs. et), the numbers from two to ten stay exactly the same whether they are counting common or neuter words. So it is always tre.

How do we make æble plural to match the number tre?

To make the word for apple plural, we add an -r to the end of æble to make it æbler. Since tre means three, the noun that follows it must be in its plural form, just like in English.

Why is the word for boy drengen instead of just dreng?

In Danish, the word for 'the' is usually attached to the end of the noun rather than being a separate word. Because 'a boy' is en dreng, you add that -en to the end to get drengen (the boy).

Does spiser translate to 'is eating' or 'eats'?

It translates to both! Danish doesn't have a separate '-ing' verb form like English does. The present tense word spiser covers both 'eats' as a general habit and 'is eating' right now.