Penninn dettur af borðinu.

The pen falls off the table.

Breakdown of Penninn dettur af borðinu.

• borðið: the table
• penninn: the pen
• detta: to fall
• af: off

Questions & Answers about Penninn dettur af borðinu.

What does the ending -inn in penninn mean?

In Icelandic the definite article is usually attached to the end of the noun.
So penn-inn = pen-the → the pen.

• penni = a pen (indefinite)
• penninn = the pen (definite, masculine singular nominative)

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Why is it borðinu and not borðið or borð?

Because the preposition af (meaning off (of/from a surface)) normally requires the dative case.
So borð (table) has to appear in dative singular, and it’s also definite here:

• borð = a table (nominative/accusative singular, indefinite)
• borði = (to/from/on) a table (dative singular, indefinite)
• borðinu = (to/from/on) the table (dative singular, definite)

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How do I know borð is neuter, and does that affect the forms?

Yes. borð is a neuter noun, and neuter nouns have their own pattern of endings.

Typical singular forms for borð:

• Nominative: borð / borðið
• Accusative: borð / borðið
• Dative: borði / borðinu
• Genitive: borðs / borðsins

(The second option in each pair is the definite form.)

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What is the dictionary form of dettur, and how is it conjugated?

The dictionary form (infinitive) is detta = to fall (down), drop.

dettur is 3rd person singular present tense:

• (ég) dett rarely used like this; normally: ég dett
• (þú) dettur
• (hann/hún/það) dettur
• (við) dettum
• (þið) dettið
• (þeir/þær/þau) detta

Common past forms:

• Past: datt (he/she/it fell)
• Past participle: dottið

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Is this sentence present tense, and can it mean “is falling” rather than “falls”?

Grammatically it’s present tense. Depending on context, Icelandic present tense can cover:

• a general truth/habit (The pen falls off the table)
• something happening right now (The pen is falling off the table)
  Often context (or adding an adverb like núna = now) makes it clear.

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Why is the subject Penninn in that form—what case is it?

Penninn is in the nominative case because it’s the subject of the sentence (the thing doing the falling).

Icelandic marks grammatical roles with case more than English does, so you’ll frequently see nouns change endings depending on whether they’re subjects, objects, etc.

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Why use af here, and what’s the difference between af and úr?

Use af when something moves off a surface:

• dettur af borðinu = falls off the table (from on top)

Use úr when something comes out of an enclosed space:

• dettur úr vasanum = falls out of the pocket

So af matches the idea of a tabletop surface.

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Could I also say Penninn fellur af borðinu? What’s the difference between detta and falla?

Yes, Penninn fellur af borðinu is possible.

A rough distinction many learners find helpful:

• detta often suggests a drop / sudden fall / accidental slipping
• falla is more general: to fall, and is used in many broader senses (including “fall” like “collapse,” “fall in battle,” etc.)

In everyday speech, there’s overlap, but detta often feels especially natural for small objects dropping.

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Can I leave off the and say Penni dettur af borði?

Yes, to make it indefinite you typically remove the attached definite article endings:

• Penni dettur af borði. = A pen falls off a table.

Notice both nouns change:

• penninn → penni (nominative singular, indefinite)
• borðinu → borði (dative singular, indefinite, still required after af)

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How is this sentence pronounced, especially ð in borðinu?

A practical pronunciation guide:

• Penninn: the stress is on the first syllable: PEN-nin. The nn is a long/strong n sound.
• dettur: DET-tur (stress on DET; tt is a crisp t sound)
• borðinu: roughly BOR-thi-nu
  The letter ð is usually a voiced “th” sound like in this (not like in think).