Jag pratar med tjejen om mobilabonnemanget.

In Swedish, the definite article is usually attached to the end of the noun instead of being a separate word.

• tjej = girl

• tjejen = the girl

• mobilabonnemang = mobile subscription / phone plan
• mobilabonnemanget = the mobile subscription / the phone plan

So Swedish often says the-girl and the-subscription as one word.

That depends on the grammatical gender of the noun.

Swedish nouns are mainly divided into two genders:

• en-words
• ett-words

tjej is an en-word, so the definite singular ending is -en:

• en tjej
• tjejen

mobilabonnemang is an ett-word, so the definite singular ending is -et:

• ett mobilabonnemang
• mobilabonnemanget

This is a very common pattern in Swedish.

Because Swedish strongly prefers compound nouns written as one word.

So instead of writing something like mobile subscription as two separate words, Swedish combines the parts:

• mobil
  • abonnemang = mobilabonnemang

Then the definite ending is added:

• mobilabonnemanget

This is completely normal in Swedish. English often uses separate words where Swedish uses one compound word.

They do different jobs:

• med = with
• om = about

So:

• Jag pratar med tjejen = I am talking with the girl
• om mobilabonnemanget = about the mobile subscription

Together: Jag pratar med tjejen om mobilabonnemanget = I’m talking with the girl about the mobile subscription.

This is very similar to English: talk with someone about something.

Yes. Pratar and talar can both mean speak/talk, but they are not always equally natural in tone.

• prata is usually more common in everyday speech
• tala can sound a bit more formal, careful, or sometimes slightly stiff depending on context

So in casual everyday Swedish, Jag pratar med tjejen... is usually the most natural choice.

Because Jag is the subject form, equivalent to I in English.

• Jag = I
• mig = me

In this sentence, the speaker is the one doing the action of talking, so Swedish uses the subject form:

• Jag pratar... = I am talking...

You would use mig when it functions as an object:

• Hon pratar med mig = She is talking with me

Literally, tjejen means the girl, but in real Swedish it can sometimes refer to:

• a girl
• a young woman
• a woman in an informal way
• in some contexts, even the girlfriend

The exact meaning depends on context. In your sentence, without more context, a learner should understand it simply as the girl or possibly the young woman.

The basic word order here is very natural:

Jag pratar med tjejen om mobilabonnemanget.

That follows the normal pattern:

subject + verb + with whom + about what

You can sometimes move parts around for emphasis, but the original version is the most neutral and standard one.

For example, Om mobilabonnemanget pratar jag med tjejen is possible, but it sounds marked and emphasizes about the mobile subscription. A beginner should stick with the original order.

Yes. pratar is the present tense of prata.

• prata = to talk
• pratar = talk / am talking / is talking

In Swedish, the present tense often covers both the simple present and the present progressive meanings that English separates:

• Jag pratar = I talk or I am talking

So in this sentence, Jag pratar med tjejen... can naturally mean I’m talking with the girl...

They can definitely look strange at first.

• jag is often pronounced roughly like yah in everyday speech, though the exact pronunciation varies by region and style.
• tjej is pronounced roughly like shay.

A few useful notes:

• Swedish j is usually like English y
• tj often gives a sh-like sound
• final spellings do not always match what an English speaker expects

So even though tjej looks complicated, it sounds much simpler than it looks.

No, that would sound ungrammatical here.

If you mean the girl and the mobile subscription, you need the definite forms:

• tjejen
• mobilabonnemanget

If you meant indefinite nouns, you would normally need the indefinite articles too:

• en tjej = a girl
• ett mobilabonnemang = a mobile subscription

So possible versions would be:

• Jag pratar med tjejen om mobilabonnemanget = I’m talking with the girl about the mobile subscription
• Jag pratar med en tjej om ett mobilabonnemang = I’m talking with a girl about a mobile subscription

Swedish does not normally just drop articles in this kind of sentence.