Ég þarf að leita aftur.

Þurfa is the dictionary form, meaning to need. In the sentence, the verb has to agree with ég (I), so it changes form:

• ég þarf = I need
• þú þarft = you need
• hann/hún/það þarf = he/she/it needs

So þarf is the correct present-tense form with ég.

Here að works like English to before an infinitive.

• þarf að leita = need to search / need to look

After þurfa, Icelandic normally uses að + infinitive. So this is a very standard pattern.

Leita is the infinitive, the basic verb form: to search, to look for, to seek.

In Ég þarf að leita aftur, the first verb is the conjugated verb þarf, and the second verb stays in the infinitive:

• þarf = finite verb
• að leita = infinitive phrase

Here aftur means again.

So the sentence means that the action of searching will be repeated.

In other contexts, aftur can also mean back:

• Ég kem aftur = I’m coming back / I’ll be back

But in Ég þarf að leita aftur, again is the natural reading.

Yes, sometimes. The version you have is very natural:

• Ég þarf að leita aftur.

You may also hear:

• Ég þarf aftur að leita.

Both can mean I need to search again, but the emphasis can shift slightly.

• að leita aftur focuses naturally on repeating the searching
• aftur að leita can make again feel a little more attached to the whole need to search idea

For a learner, Ég þarf að leita aftur is a great default pattern.

Not always. In this sentence, the object is simply not stated, which is perfectly fine if the context already makes it clear.

If you want to say what you are looking for, everyday Icelandic often uses leita að + dative:

• Ég þarf að leita að lyklunum aftur.
  = I need to look for the keys again.

You may also come across a more formal/literary pattern without að, where leita takes a genitive object. But for most learners, leita að is the most useful everyday pattern to recognize.

This is the normal main-clause order in Icelandic:

• Ég = subject
• þarf = finite verb
• then the rest of the sentence

Icelandic is a verb-second language in main clauses. That means the finite verb usually comes in the second position.

Because ég comes first, þarf comes second:

• Ég þarf að leita aftur.

If something else is placed first, the verb still usually stays second:

• Núna þarf ég að leita aftur.
  = Now I need to search again.

Usually, no. Icelandic normally keeps subject pronouns in ordinary sentences.

So:

• Ég þarf að leita aftur. = normal
• Þarf að leita aftur. = not a neutral full sentence by itself

Even though Icelandic verbs change form, the pronoun is still usually expressed.

These are two special Icelandic letters:

• þ sounds like th in thin
• ð usually sounds like th in this

So in your sentence:

• þarf starts with the thin sound
• að contains ð, though in fast speech it can sound quite weak

A rough pronunciation guide for the whole sentence is:

• Ég þarf að leita aftur
  ≈ yeg tharf ath LAY-ta AF-tur

That is only approximate, but it is a helpful starting point.

Usually þarf að is best understood as need to or have to.

• Ég þarf að leita aftur.
  = I need to search again.

Depending on context, English might also translate it as I have to search again, but need to is the closest basic match.

So if you see þurfa að + infinitive, think:

• need to do something