Ögonblicket var viktigt.

Because -et is the definite article attached to a neuter noun.

• ögonblick = moment, an instant
• ögonblicket = the moment

In Swedish, the definite article is often added to the end of the noun instead of appearing as a separate word like English the.

The form ögonblicket shows it. Swedish nouns are mainly divided into:

• common gender nouns, which usually take -en in the definite singular
• neuter nouns, which usually take -et in the definite singular

So:

• common gender: bok → boken
• neuter: ögonblick → ögonblicket

That tells you ögonblick is a neuter noun, also called an ett-word.

Because the adjective agrees with the noun’s gender.

Since ögonblick is a neuter noun, the adjective in this sentence takes the -t form:

• en viktig dag = an important day
• ett viktigt ögonblick = an important moment

Even though the sentence uses ögonblicket (the moment), the predicate adjective still follows the noun’s gender:

• Ögonblicket var viktigt.

This is a very common pattern in Swedish:

• Huset är stort.
• Barnet var trött.
• Problemet blev allvarligt.

Because predicate adjectives in Swedish do not usually show definiteness the way attributive adjectives do.

Compare:

• det viktiga ögonblicket = the important moment
  Here, viktiga comes before the noun, so it is attributive.

But in:

• Ögonblicket var viktigt.
  the adjective comes after var and describes the subject, so it is a predicate adjective.

Predicate adjectives usually agree only with:

• gender
• number

So here, singular + neuter gives viktigt.

Var is the past tense of är from the verb vara (to be).

• är = is / am / are
• var = was
• varit = been

So:

• Ögonblicket är viktigt. = The moment is important.
• Ögonblicket var viktigt. = The moment was important.

This sentence has the normal Swedish main-clause word order:

• Ögonblicket = subject
• var = verb
• viktigt = complement

So the structure is:

Subject + verb + adjective

That is very natural and straightforward.

Swedish main clauses usually follow V2 word order, meaning the finite verb comes in the second position. In this sentence, the subject is first, so the verb naturally comes right after it.

A rough guide is: UR-gon-blik-et.

A few useful pronunciation notes:

• ö is a vowel that does not exist exactly in English. It is somewhat similar to the vowel in British bird, but not identical.
• g in ögon is pronounced as a hard g here.
• blick has a short i, like the i in bit.
• The final -et is usually unstressed.

You do not need perfect pronunciation right away, but it helps to notice that ö is an important Swedish vowel and should not be pronounced like English o.

Often yes, but it depends on context.

Ögonblick usually means:

• moment
• instant

It often feels a bit more like a specific point in time than a longer stretch.

For example:

• Ett ögonblick! = One moment!
• Det var ett viktigt ögonblick. = It was an important moment.

A related word is stund, which can feel more like a little while or a short period of time, depending on context.

Because Swedish often puts the at the end of the noun as a suffix.

So instead of:

• English: the moment

you get:

• Swedish: ögonblicket

This is one of the biggest differences from English. Swedish does have words like den, det, and de, but in a simple sentence like this, the definiteness is already built into ögonblicket.

Yes. That means It was an important moment.

The difference is:

• Ögonblicket var viktigt. = The moment was important.
  This refers to a specific moment already known from context.

• Det var ett viktigt ögonblick. = It was an important moment.
  This introduces or identifies the moment more generally.

Both are natural, but they are used in slightly different situations.

No. Swedish does not capitalize all nouns.

So you write:

• ögonblicket
• viktigt

The only capital letter here is the first one because it begins the sentence:

• Ögonblicket var viktigt.