Geturðu sent mér skjámynd af þessu áður en þú eyðir skilaboðunum?

Yes. Geturðu is a very common contracted form of getur þú.

• getur = can
• þú = you

In everyday Icelandic, þú often gets attached to the verb as -ðu in questions and casual speech/writing. So Geturðu...? is the natural equivalent of Can you...? The full form Getur þú...? is also possible, but it sounds a bit more explicit or formal.

After geta in this kind of sentence, Icelandic normally uses the supine form of the main verb, not the dictionary infinitive.

So:

• að senda = to send
• sent = the form used here after getur

That means Geturðu sent mér... is the normal pattern, just like:

• Ég get komið = I can come
• Hún getur lesið = She can read

So sent here does not mean past tense. It is simply the required verb form after getur.

Because mér is the dative form of ég, and senda usually works like send someone something.

Pattern:

• senda einhverjum eitthvað

So in this sentence:

• mér = to me
• skjámynd = the thing being sent

If you used mig, that would be accusative, and it would be wrong here.

Skjámynd literally means something like screen-image:

• skjár = screen
• mynd = image/picture

Together, skjámynd means screenshot. Icelandic often forms words this way by combining smaller meaningful parts.

To say a screenshot of this, Icelandic commonly uses af:

• skjámynd af þessu = a screenshot of this

Here, af has the sense of of/from. This is just the normal Icelandic way to express what the screenshot shows. English uses of, but Icelandic uses af.

Because af takes the dative case, and the dative form of þetta is þessu.

So:

• þetta = nominative/accusative this
• þessu = dative this

Since the phrase is af þessu, the dative is required.

Yes. Áður en is a fixed expression meaning before when it introduces a full clause.

So:

• áður en þú eyðir skilaboðunum = before you delete the messages

You can think of it as the standard way to say before + subject + verb.

Because áður en introduces a subordinate clause, not a question.

In the main question, Icelandic has question word order:

• Geturðu sent... ?

But after áður en, the clause goes back to normal statement order:

• þú eyðir skilaboðunum

So áður en þú eyðir... is correct. Áður en eyðir þú... would sound wrong here.

Eyðir comes from að eyða. In this sentence, it means delete or erase.

So:

• þú eyðir skilaboðunum = you delete the messages

This verb can have several related meanings depending on context, such as spend, waste, destroy, or erase, but here the meaning is clearly delete.

Because it is dative plural definite.

There are two reasons for that:

1. eyða takes a dative object

   • að eyða einhverju = to delete something

2. The sentence means the messages, not just messages in general

   • so the definite article is included

So:

• skilaboð = messages
• skilaboðunum = the messages in dative plural

The ending -unum is a very common dative plural definite ending for neuter nouns.

Because skilaboðin would be nominative/accusative plural definite, but this sentence needs the dative after eyða.

Compare:

• Skilaboðin eru hér. = The messages are here.

  • nominative

• Ég les skilaboðin. = I read the messages.

  • accusative

• Ég eyði skilaboðunum. = I delete the messages.

  • dative

So the case changes because the verb changes.

Yes. It works very much like English Can you send me...? It is a normal, natural request.

It is:

• informal singular, because it uses þú
• polite in an everyday way, but not especially formal

If you wanted to sound a bit softer, you might say:

• Gætirðu sent mér... ? = Could you send me...?

But Geturðu sent mér... ? is already perfectly natural and polite in ordinary conversation.

These two letters are very important in Icelandic:

• þ is like the th in thing
• ð is like the th in this (though in some positions it can sound weaker)

Examples from the sentence:

• þú
• þessu
• eyðir
• skilaboðunum

So if you are reading it aloud, those letters should sound like English th, not like t, d, or z.