Taflan í skýrslunni er gagnleg.

Because Icelandic usually puts the definite article onto the end of the noun instead of using a separate word like English the.

• tafla = table
• taflan = the table

So taflan is the definite form of tafla.

Taflan is nominative singular.

It is nominative because it is the subject of the sentence — the thing being described as useful.

Structure:

• Taflan = the subject
• er = is
• gagnleg = useful

So the sentence is built like The table is useful, and the subject normally appears in the nominative.

Because after the preposition í, Icelandic changes the noun’s form depending on meaning.

Here, í means in in the sense of location — the table is located in the report. With this meaning, í takes the dative case.

So:

• dictionary form: skýrsla = report
• dative singular definite: skýrslunni = in the report

That is why you get í skýrslunni, not í skýrsla.

Many Icelandic prepositions govern particular cases. Í is especially important because it can take:

• dative for location: in, inside
• accusative for motion into

Here the meaning is static location:

• Taflan í skýrslunni = The table in the report

No movement is involved, so Icelandic uses the dative.

A useful comparison:

• í skýrslunni = in the report (already there)
• í skýrsluna = into the report (movement into it)

Skýrslunni can be broken down like this:

• skýrsl- = the stem
• -u = a dative singular ending for this feminine noun pattern
• -nni = the definite article in this form

So:

• skýrsla = report
• skýrslunni = the report, in the dative singular

This kind of stacking of noun ending + article ending is very typical in Icelandic.

Because Icelandic adjectives agree with the noun they describe in gender, number, and case.

The subject is taflan:

• tafla is feminine
• it is singular
• it is nominative

So the adjective must match that:

• masculine singular: gagnlegur
• feminine singular: gagnleg
• neuter singular: gagnlegt

Since tafla is feminine singular, the correct form is gagnleg.

Yes. After the verb vera (to be), Icelandic often uses a predicate adjective, just like English.

So in:

• Taflan er gagnleg

the adjective gagnleg describes the subject taflan.

This works like English:

• The table is useful

Even though the adjective comes after is/er, it still refers back to the subject.

Er is the present tense singular form of the verb vera (to be).

So:

• vera = to be
• er = is

In this sentence:

• Taflan ... er gagnleg = The table ... is useful

It is one of the most common verbs in Icelandic, and its forms are irregular, so it is worth memorizing early.

This is the normal, straightforward word order.

• Taflan í skýrslunni = the subject noun phrase
• er = the verb
• gagnleg = the complement/adjective

So the pattern is basically:

Subject + Verb + Complement

That said, Icelandic is a verb-second language, so in many sentences the finite verb appears in the second position. Here that happens naturally because the subject comes first.

Because í skýrslunni is part of the noun phrase and tells you which table we are talking about:

• taflan = the table
• taflan í skýrslunni = the table in the report

So it works like an English post-modifier: it narrows down the noun.

The whole subject is not just taflan, but taflan í skýrslunni.

Yes. In Icelandic, tafla can refer to a table, chart, or similar arranged display of information, depending on context.

So in a sentence with skýrsla (report), many learners will naturally understand taflan as something like:

• a data table
• a chart
• a figure-like table

The exact English translation depends on context, but grammatically the Icelandic sentence stays the same.

The main change would be the adjective form, because the adjective has to agree with the noun.

For example:

• masculine: Bíllinn í skýrslunni er gagnlegur.
• feminine: Taflan í skýrslunni er gagnleg.
• neuter: Ritið í skýrslunni er gagnlegt.

So this sentence is a good example of adjective agreement in action:

• gagnlegur = masculine
• gagnleg = feminine
• gagnlegt = neuter

A learner-friendly approximation is:

SKEER-sluhn-ni

A few things to notice:

• ý is a long vowel, roughly like ee in many modern pronunciations
• rsl is a consonant cluster that may feel awkward at first
• the ending -unni / -nni should be pronounced clearly

You do not need perfect pronunciation immediately, but it helps to recognize that Icelandic often keeps these written endings because they carry important grammar information.