Jag tappade mobilen på bussen, så nu är jag orolig.

Tappade is the past tense of the verb tappa.

• tappa = to drop / lose
• tappade = dropped / lost

It is a regular verb, so the past tense ends in -ade.

It can mean both, depending on context.

• drop: if you physically let something fall
• lose: if something is no longer in your possession because of that accident

In this sentence, English would often prefer lose: you lost your phone on the bus. But the Swedish verb is still tappa.

Swedish often uses the definite form for things that are obviously connected to the speaker, especially everyday personal items.

So Jag tappade mobilen sounds very natural.

You can also say Jag tappade min mobil, and that is correct too. It just sounds a little more explicit, like you are stressing that it was my phone.

The base noun is mobil, which is a common-gender noun.

Its definite singular form is made by adding -en:

• en mobil = a mobile phone
• mobilen = the mobile phone

Also, in Swedish, mobil normally means mobile phone / cell phone. It usually does not mean the hanging decoration that English mobile can mean.

With transport, Swedish very often uses på.

So you commonly hear:

• på bussen
• på tåget
• på flyget

Even though English speakers may expect in the bus, Swedish usually says på bussen in this kind of situation.

I bussen is possible, but it tends to emphasize being physically inside the bus rather than simply being on it as a passenger.

Here så means so, therefore, or as a result.

It connects the two parts of the sentence:

• first: something happened
• second: this is the consequence

So så nu är jag orolig means something like so now I’m worried.

Because Swedish main clauses follow the V2 rule: the finite verb usually comes in the second position.

In nu är jag orolig:

1. nu is first
2. är must come second
3. jag comes after the verb

So the order is:

• nu
• är
• jag
• orolig

That is why nu jag är orolig is incorrect.

After så, the next clause still behaves like a normal main clause.

In this clause, nu is placed first, so the verb är comes next because of the V2 rule. Then comes the subject jag.

So:

• så nu är jag orolig = correct
• så nu jag är orolig = incorrect

A useful way to think about it is that så introduces the clause, but inside that clause, Swedish word order still has to follow the normal pattern.

Because after jag är, the adjective is normally in its basic form.

So:

• jag är orolig = I am worried

Other forms appear in other situations, for example:

• ett oroligt barn = a worried / restless child
• de är oroliga = they are worried

Here, with jag, the plain form orolig is the correct one.

Because the sentence refers to two different times:

• Jag tappade mobilen på bussen = the losing happened earlier
• nu är jag orolig = the worry is true now

So the sentence moves naturally from a past event to a present result. This is completely normal in Swedish.

Yes, absolutely.

Jag har tappat mobilen på bussen uses the present perfect, which often feels a little more connected to the present situation — for example, the phone is still missing now.

Jag tappade mobilen på bussen uses the simple past, which tells the event as something that happened in the past.

In everyday Swedish, both can work. The difference is mostly one of nuance.