Gufan úr pottinum er svo heit að ég stíg aðeins aftur.

Because gufan means the steam, while gufa means steam in a more general or indefinite sense.

Icelandic usually puts the definite article on the end of the noun instead of using a separate word like the:

• gufa = steam
• gufan = the steam

So Gufan úr pottinum means The steam from the pot.

Because the preposition úr governs the dative case.

The noun pottur means pot, but after úr it changes form:

• pottur = pot
• úr potti = from a pot
• úr pottinum = from the pot

The ending -num here includes both:

• the dative ending
• the suffixed definite article

So úr pottinum literally means out of/from the pot.

Because heit has to agree with gufan, which is a feminine singular noun.

In Icelandic, adjectives change form to match the noun’s gender, number, and sometimes case.

Here are the basic singular forms of heitur = hot:

• masculine: heitur
• feminine: heit
• neuter: heitt

Since gufa is feminine, Icelandic says:

• Gufan er heit = The steam is hot

not heitur or heitt.

This is a very common Icelandic pattern meaning so ... that.

• svo heit að ... = so hot that ...

So the sentence structure is:

• Gufan er svo heit að ég stíg aðeins aftur
• The steam is so hot that I step back a little

A useful thing to remember is that svo by itself can sometimes mean so, thus, or even very in some contexts, but in the pattern svo + adjective + að, it specifically means so ... that.

Here að means that and introduces the result clause:

• svo heit að ég stíg aðeins aftur
• so hot that I step back

This is different from another very common að, which is the infinitive marker, like to in English:

• að fara = to go

So Icelandic learners often have to get used to að having more than one job. In this sentence, it is the conjunction that.

Because stíg is the 1st person singular present tense form of the verb stíga.

• infinitive: stíga = to step
• ég stíg = I step
• þú stígur = you step
• hann/hún/það stígur = he/she/it steps

So ég stíg means I step or I am stepping, depending on context.

This verb also changes its stem vowel, which is common in strong Icelandic verbs:

• stíga → stíg

Here aðeins means something like only, just, or a little.

In this sentence, the most natural sense is:

• ég stíg aðeins aftur = I step back a little / I just step back

It softens the action and suggests a small movement rather than a dramatic retreat.

Depending on context, aðeins can mean:

• only
• just
• slightly / a little

So learners should not expect a single fixed English equivalent every time.

It can mean both, depending on context.

Common meanings of aftur:

• back
• again

In this sentence, it clearly means back, because the idea is that the steam is so hot that the speaker moves away from it:

• stíg aftur = step back

If the context were different, aftur could also mean again:

• Ég kem aftur = I’ll come again / I’ll come back

So context tells you which meaning is intended.

Not exactly as a single dictionary verb, but it works similarly.

The main verb is stíga = to step, and aftur is an adverb giving the direction/result:

• stíga aftur = step back

This is very natural Icelandic. You may also see other ways to express the idea, such as til baka in some contexts, but aftur is perfectly normal here.

So it is best to think of it as:

• verb: stíga
• directional adverb: aftur

Because Icelandic usually attaches the definite article to the noun itself.

Examples from this sentence:

• gufan = the steam
• pottinum = the pot (in dative)

This is one of the big differences from English. Instead of a separate word like the, Icelandic often adds a suffix:

• -inn, -in, -ið, and related forms depending on gender, number, and case

So learners need to get used to seeing definiteness built into the noun form.

This is the normal basic word order for a main clause in Icelandic:

• subject: Gufan úr pottinum
• verb: er
• complement: svo heit að ég stíg aðeins aftur

Inside the að-clause, the word order is also straightforward:

• ég = subject
• stíg = verb
• aðeins aftur = adverbial part

So for an English speaker, this sentence is actually fairly close to English structure. The main challenge is not the word order, but the noun endings, adjective agreement, and verb form.

Sometimes svo can feel close to very, but in this sentence you should read it together with að:

• svo heit að ... = so hot that ...

If you say only:

• Gufan er svo heit

that could mean The steam is so hot, often with an implied continuation or strong emphasis.

But once að follows, the meaning is clearly the full so ... that construction, not just a simple very hot.