Mormorn hällde upp te ur termosen medan barnen åt melon.

Mormor means maternal grandmother. The ending -n makes it definite, so mormorn means the grandmother.

In Swedish, many common-gender nouns take -en or just -n in the definite singular:

• en mormor = a grandmother
• mormorn = the grandmother

So here, the sentence is talking about a specific grandmother already understood in context.

Not exactly. Swedish distinguishes between the two grandmothers:

• mormor = mother’s mother
• farmor = father’s mother

Likewise:

• morfar = mother’s father
• farfar = father’s father

So mormorn is specifically the maternal grandmother.

Because hälla upp is a very common verb phrase meaning to pour up / pour out / serve by pouring, especially with drinks.

• hälla = to pour
• hälla upp = to pour into cups/glasses, to serve by pouring

So Mormorn hällde upp te suggests she was pouring tea, probably into cups. If you only said hällde te, it would sound more neutral and less natural in this context.

This is a normal feature of Swedish particle verbs.

The basic verb is hälla, and upp is a particle. In many main clauses, the particle is placed later in the sentence:

• Hon hällde upp te.

But in some other forms, the parts stay together:

• att hälla upp te = to pour tea
• Hon ville hälla upp te.

This is similar to English verb-particle combinations like pour out, pick up, or turn on.

Ur means out of and is used when something comes from inside a container.

So:

• ur termosen = out of the thermos

That fits naturally with pouring liquid from a container.

Från usually means from, but it is more general:

• från skolan = from school
• från bordet = from the table

For liquid being poured from inside something, ur is the best choice.

Termos means thermos or vacuum flask. The ending -en makes it definite:

• en termos = a thermos
• termosen = the thermos

So ur termosen means out of the thermos.

Because in this sentence both are being used in a general, uncountable or substance-like way.

• hällde upp te = poured tea
• åt melon = ate melon

This is similar to English, where you often say:

• drink tea
• eat melon

You would add an article if you meant a specific item or portion:

• ett te can mean a tea in some contexts, especially ordering in a café
• en melon = a whole melon

But here the focus is just on the substance/food, not one counted unit.

Barnen is the definite plural of barn:

• ett barn = a child
• barn = children
• barnen = the children

So the sentence refers to specific children, not just children in general.

A useful thing to notice is that barn has the same form in singular indefinite and plural indefinite:

• ett barn = a child
• barn = children

Only the article or context tells you which it is.

Yes, åt can be a preposition meaning toward or for, but here it is a verb form.

In this sentence, åt is the past tense of äta:

• äta = to eat
• åt = ate
• ätit = eaten

So:

• barnen åt melon = the children ate melon

Learners often notice this because the same written word åt can also be a preposition in other sentences.

Because the sentence describes an event in the past. Both actions were happening in the same past-time scene:

• Mormorn hällde upp te
• barnen åt melon

Swedish often uses the simple past, called preterite, where English might sometimes use the past continuous:

• Grandma was pouring tea while the children were eating melon

Swedish does not need a special continuous form here.

Medan means while.

It connects two actions that happened at the same time:

• Mormorn hällde upp te
• medan barnen åt melon

So the structure is:

• action 1 + medan
  • action 2

It is a very common way to show simultaneous actions.

After medan, Swedish usually uses normal subordinate-clause word order. In this sentence, that means:

• medan barnen åt melon

The subject barnen comes before the verb åt.

This is different from main-clause word order, where Swedish often puts the verb in second position. Here, the medan clause is a subordinate clause, so the word order is more straightforward.

Yes:

• Medan barnen åt melon hällde mormorn upp te.

That is also correct. When a subordinate clause comes first, the main clause that follows still obeys Swedish word-order rules, so the finite verb comes early:

• Medan barnen åt melon hällde mormorn upp te

Notice that you do not say:

• Medan barnen åt melon mormorn hällde upp te

That would be incorrect.

Strictly speaking, melon here is best understood as a mass or food noun, not as one whole melon. It is similar to saying they ate chicken or they ate fruit.

So åt melon does not strongly focus on number. It just means they were eating melon as food.

If you wanted to emphasize a whole melon, you might say:

• åt en melon = ate a melon

But in normal usage, åt melon is perfectly natural for ate melon.