Ég elska þau öll.

Because é is a separate vowel in Icelandic, not just an optional accent mark.

In Icelandic, accents usually show a different vowel sound, not extra stress. So:

• e and é are different vowels
• Ég must be spelled with é
• at the start of the sentence it is capitalized, so you see Ég

For an English speaker, é in ég sounds roughly like ye in yes, though the real Icelandic sound is a bit more specific.

A rough learner-friendly pronunciation is:

• Ég ≈ yeg
• elska ≈ EL-ska
• þau ≈ thoy or thœy
• öll ≈ a rounded vowel plus tl, something like ötl

A more technical IPA version is approximately:

• [jɛːɣ ˈɛlska θœy ˈœtl̥]

A few key sounds:

• þ = th as in thin
• au is a diphthong, somewhat like oy, but more rounded
• ö is like German ö or French eu

Þau is the neuter plural form of the third-person pronoun.

Icelandic pronouns reflect gender and number much more than English does. English just has they/them, but Icelandic distinguishes:

• masculine plural
• feminine plural
• neuter plural

Þau is used when the group being referred to is:

• grammatically neuter plural
• a mixed-gender group
• sometimes a group of children
• sometimes non-human things, depending on the noun being referred to

So þau does not automatically mean the group is non-human. It depends on what þau refers back to.

They are all forms of they/them, but they differ by gender.

Basic plural forms are:

• þeir = masculine plural
• þær = feminine plural
• þau = neuter plural

Because this sentence uses a direct object, the case matters too. In the accusative plural, the forms are:

• masculine: þá
• feminine: þær
• neuter: þau

So if the speaker were talking about:

• masculine plural people/things: Ég elska þá alla
• feminine plural people/things: Ég elska þær allar
• neuter plural / mixed group: Ég elska þau öll

It is in the accusative case because it is the direct object of elska.

In Ég elska þau öll:

• Ég = subject
• elska = verb
• þau öll = direct object

The verb að elska normally takes a direct object in the accusative, so the pronoun must appear in an accusative form.

Öll means all here.

So þau öll means:

• all of them
• them all

It adds the idea that the speaker loves the entire group, not just some of them.

With a pronoun, Icelandic very often puts allur after the pronoun:

• þau öll = all of them / them all

That is very natural.

By contrast, when allur comes before a noun, that is also normal:

• öll börnin = all the children

So a useful pattern is:

• pronoun + allur → þau öll
• allur + noun → öll börnin

Because öll has to agree with þau in gender, number, and case.

Here, þau is:

• neuter
• plural
• accusative

So allur must also be neuter plural accusative, which is öll.

Compare:

• masculine accusative plural: alla
• feminine accusative plural: allar
• neuter accusative plural: öll

That is why you get:

• þá alla
• þær allar
• þau öll

Elska is the present-tense form used with ég.

The verb að elska is conjugated in the present tense like this:

• ég elska = I love
• þú elskar = you love
• hann/hún/það elskar = he/she/it loves
• við elskum = we love
• þið elskið = you all love
• þeir/þær/þau elska = they love

So in Ég elska þau öll, the form elska matches the subject ég.

Usually no. Icelandic normally keeps the subject pronoun.

So:

• Ég elska þau öll is the normal full sentence

Even though the verb ending gives some information, Icelandic is generally not a language where you regularly drop subject pronouns in ordinary speech the way you might in Spanish or Italian.

Yes. This is the most neutral, standard order:

• Subject + Verb + Object
• Ég + elska + þau öll

That is the ordinary way to say it.

Icelandic word order can become more flexible for emphasis, contrast, or special sentence structure, but Ég elska þau öll is the straightforward default pattern a learner should aim for first.