Questions & Answers about Það er mikil gleði í brúðkaupinu.
In this sentence, það er works like English there is.
So Það er mikil gleði... is literally something like There is great joy...
Icelandic often uses það er to introduce the existence or presence of something, especially when the real subject comes later in the sentence.
- það = it/that
- er = is
But here you should understand the whole expression það er as an existential pattern, not as a literal it is.
Because mikil has to agree with gleði.
The noun gleði is:
- feminine
- singular
- nominative here
So the adjective mikill must also appear in the feminine singular nominative form:
- masculine: mikill
- feminine: mikil
- neuter: mikið
That is why the sentence has mikil gleði.