Ég afrita heimilisfangið úr tölvupóstinum og lími það í pöntunina.

Because the subject stays the same.

In Icelandic, when two verbs share the same subject, it is very common to mention the subject only once:

• Ég afrita ... og lími ...

This means I copy ... and paste ....
You could also say Ég afrita ... og ég lími ..., but that is more explicit and usually less natural unless you want extra emphasis.

These two verbs belong to different conjugation patterns.

• að afrita → ég afrita
• að líma → ég lími

So even though both are present tense and both mean actions done by I, they do not form the first-person singular in the same way.

This is a very normal feature of Icelandic verbs: you have to learn which pattern a verb follows.

In this sentence both forms are present indicative:

• ég afrita = I copy
• ég lími = I paste

Icelandic usually attaches the definite article to the end of the noun instead of using a separate word like English the.

So here you get:

• heimilisfangið = the address
• tölvupóstinum = the email
• pöntunina = the order

Those endings are not just the by themselves. They also reflect grammar such as gender, number, and case.

So the exact ending changes depending on the noun’s role in the sentence.

Here heimilisfangið is the direct object of afrita, so it is in the accusative.

However, heimilisfang is a neuter noun, and for many neuter nouns the singular nominative and accusative look the same. So:

• nominative definite: heimilisfangið
• accusative definite: heimilisfangið

That is why the form does not visibly change here.

Because heimilisfang is a neuter singular noun.

In Icelandic, pronouns usually agree with the noun they refer to in gender and number. Since heimilisfang is neuter, the matching pronoun is það.

So:

• heimilisfangið = neuter singular
• það = it, referring back to that neuter singular noun

In this sentence það is the object of lími, but the neuter singular form is still það.

úr means out of / from, and it takes the dative case.

Here it suggests taking the address out of the email as the source:

• úr tölvupóstinum = from the email

A learner may wonder about frá, since that also often means from. The difference is roughly this:

• úr = out of, from inside something, or extracted from something
• frá = from, away from a source or point

In this sentence, úr fits well because the address is being pulled out of the email’s contents.

Because úr requires the dative case, and tölvupóstur is masculine singular with the definite article attached.

So the chain is roughly:

• basic noun: tölvupóstur
• dative singular: tölvupósti
• dative singular definite: tölvupóstinum

So tölvupóstinum means the email in the dative.

Because í can take either accusative or dative, depending on meaning.

• accusative = motion or direction, often into
• dative = location, often in

Here the idea is paste it into the order, so Icelandic uses accusative:

• í pöntunina

If you said í pöntuninni, that would sound more like in the order, describing location rather than movement.

A useful contrast:

• Ég lími það í pöntunina. = I paste it into the order.
• Það er í pöntuninni. = It is in the order.

That is the most natural word order here.

In Icelandic, short unstressed object pronouns often come before longer prepositional phrases:

• lími það í pöntunina

This feels more natural than putting the pronoun at the very end.

So the structure is:

• verb: lími
• direct object pronoun: það
• prepositional phrase: í pöntunina

English does something similar in many cases: paste it into the order, not usually paste into the order it.

It is both.

The basic physical meaning of að líma is to glue / stick. But in computer language it is also the normal verb for to paste.

So in this sentence:

• afrita = copy
• líma = paste

That is the standard copy-and-paste pair.

A good quick guide is:

• þ = the th in thing
• ð = the th in this

So in það, the first sound is like thing, and the last consonant is like this.

A couple of helpful notes:

• þ is always voiceless, like thing
• ð is voiced, like this
• at the end of a word, ð can sound weaker than English speakers expect

So það is roughly thath, with the first th voiceless and the second one voiced.