Learn Danish: Gid min bror ejede den enorme villa! - I wish my brother owned the huge villa!

Just like in English (I wish my brother owned), Danish uses the past tense to express an unreal or imaginary situation in the present. When you start a sentence with gid (if only / I wish), the verb that follows takes the past tense to show that the wish hasn't actually come true yet.

Does the word gid literally translate to 'I wish'?

Gid is a special word that means something like 'if only' or 'would that'. It doesn't change depending on who is making the wish, so you don't need a subject pronoun like jeg (I) before it. It simply sets the mood of the whole sentence to show a strong desire.

Why do we say den enorme villa instead of putting the definite ending on the noun like villaen enorme?

In Danish, when you put an adjective in front of a definite noun, you cannot use the normal ending on the noun itself (like villaen). Instead, you must use the separate definite article den for en-words, add an -e to the adjective (enorme), and leave the noun in its base form (villa).

Why does the adjective enorm change to enorme with an -e at the end here?

Because the phrase is definite. Whenever you use a definite article like den (the) or a possessive word like min (my), any adjective following it gets a definite ending. For almost all adjectives, that ending is an -e.