Learn Hardcore Icelandic: Ég hef séð þig áður.

This sentence uses the present perfect. Icelandic forms the present perfect by combining the auxiliary verb hafa in the present tense (here hef for first person singular) with the past participle of the main verb (séð, past participle of sjá).

Why is séð spelled with an é and ending in ð, and what is its infinitive?

Séð is the past participle of the strong verb sjá, whose infinitive means to see. Strong verbs in Icelandic change their stem vowel in the past participle; here sjá → séð, and you add the letter ð.

Why does the sentence use þig instead of þú?

Þú is the nominative (subject) form of you. Since “you” is the direct object of séð here, it appears in the accusative form þig.

How does word order work in this sentence?

Icelandic follows the V2 rule (verb-second). The finite verb (hef) must be the second element:

Ég (subject) is first.
Hef (auxiliary verb) is second.
The rest—past participle séð, object þig, adverb áður—follow.

Can I move áður (before) to a different position in the sentence?

Yes. A very common alternative is Ég hef áður séð þig, placing áður between the auxiliary and the participle without changing the meaning, only shifting slight emphasis onto áður.

How do I make this sentence negative, and how do I turn it into a question?

Negative: insert ekki after the auxiliary:
• Ég hef ekki séð þig áður.
Question: invert auxiliary and subject:
• Hef ég séð þig áður?

Do native speakers prefer the perfect form, or is the simple past more common?

In daily conversation, Icelandic often uses the simple past. You’ll more frequently hear Ég sá þig áður. Ég hef séð þig áður is grammatically correct but can sound more formal or literary.

How do I pronounce Ég hef séð þig áður?

A rough phonetic guide:
• Ég /jɛːɣ/ (yeg)
• hef /hɛv/ (hev)
• séð /sɛið/ or /sɛiθ/ (sayth)
• þig /θɪɣ/ (thig)
• áður /ˈauːðʏr/ (ow-dhur)
Put it all together: yeg hev sayth thig ow-dhur.