Við rannsökum óhappið.

• Við = we (subject)
• rannsökum = investigate / are investigating (verb)
• óhappið = the accident / the mishap (direct object)

So the structure is the very common Icelandic pattern:

subject + verb + object

That makes this sentence quite straightforward.

Rannsaka is the dictionary form, meaning to investigate.

In the sentence, the verb has to agree with við (we), so it changes form:

• að rannsaka = to investigate
• við rannsökum = we investigate / we are investigating

So -um here is the 1st person plural present tense ending.

It can mean either, depending on context.

In Icelandic, the simple present tense often covers both:

• we investigate
• we are investigating

So Við rannsökum óhappið could mean either one in English. Context tells you which is more natural.

It is the direct object of rannsökum, so it appears in the accusative.

The noun is óhapp (accident, mishap), which is a neuter noun. In this sentence you see:

• óhapp = accident / mishap
• óhappið = the accident / the mishap

For this noun, the nominative singular definite and accusative singular definite look the same: óhappið.

So even though it is functioning as an accusative object, the form does not visibly change here.

In Icelandic, the definite article is usually added to the end of the noun as a suffix.

So:

• óhapp = accident
• óhappið = the accident

This is very normal in Icelandic. English uses a separate word (the), but Icelandic often builds it into the noun itself.

The basic dictionary form is óhapp.

Then the definite article is added:

• óhapp = an accident / accident
• óhappið = the accident

So if you look it up in a dictionary, you would usually look for óhapp, not óhappið.

Yes. It is the normal, neutral word order:

Við (subject) + rannsökum (verb) + óhappið (object)

That said, Icelandic word order can shift more than English for emphasis, especially because Icelandic is a verb-second language. But this sentence is the plain, standard order you would expect in a simple statement.

A rough learner-friendly pronunciation is:

vith RAN-suh-kum OH-hap-pith

A few notes:

• Við: the ð is the Icelandic letter eth, somewhat like th
• rannsökum: stress is on the first syllable, RAN-
• óhappið: ó is a long vowel, roughly oh
• -ið at the end is often pronounced roughly like -ith

As in most Icelandic words, the main stress is on the first syllable.

The accent mark in Icelandic is not optional decoration; it shows a different vowel.

So ó is a distinct vowel from o. You should learn it as part of the spelling and pronunciation of the word.

In other words:

• óhapp is the correct word
• the accent is part of the word itself

It is a regular verb of the -a type in its dictionary form.

Its infinitive is:

• að rannsaka = to investigate

In the present tense, you get forms such as:

• ég rannsaka = I investigate
• við rannsökum = we investigate

One thing learners notice is that the vowel changes:

• rannsaka
• rannsökum

So the ending changes, and the stem vowel also shifts here.

This is due to a common Icelandic sound change called u-umlaut.

Very roughly, a following u in the ending can cause an earlier a to become ö.

So:

• rannsaka
• rannsökum

This kind of vowel alternation is extremely common in Icelandic, so it is worth getting used to early.

Yes, and that can confuse beginners.

• við can be the pronoun we
• við can also be the preposition with

In Við rannsökum óhappið, it clearly means we, because it is functioning as the subject of the verb.

So you have to identify it from context and sentence structure.

Yes, a few key Icelandic features are packed into this short sentence:

1. Verb agreement

   • rannsökum changes to match við (we)

2. Definite article suffix

   • óhappið = the accident

3. Case

   • the object is accusative, even though the form here looks the same as nominative

4. Present tense overlap

   • rannsökum can mean both investigate and are investigating

5. Umlaut/vowel change

   • rannsaka → rannsökum

So although the sentence is simple, it introduces several very typical Icelandic grammar patterns.