Om jag snubblar när jag bär väskan, tappar jag kanske både nycklarna och mobilen.

Swedish often uses the present tense for things that are generally true, possible, or expected in the future.

So Om jag snubblar ... tappar jag kanske ... is completely natural for a possible future situation.

This works a lot like English sentences such as:

• If I trip, I might drop my keys
• When I come home, I eat
• If it rains, we stay inside

Swedish usually does not need a special future form here.

• snubblar = trip
• bär = carry
• tappar = drop

The sentence is talking about a possible event, but Swedish still uses present tense.

Om means if and introduces a condition.

So:

• Om jag snubblar = If I trip

It tells you that the second part depends on the first part. In other words, dropping the keys and phone may happen if the speaker trips.

They do different jobs here:

• om = if
• när = when

So the structure is:

• Om jag snubblar = If I trip
• när jag bär väskan = when I am carrying the bag

In this sentence, när jag bär väskan gives the time or situation in which the tripping happens.

A useful way to read the whole first part is:

• If I trip when I’m carrying the bag ...

So om introduces the condition, while när gives the time/context inside that condition.

Because after när, Swedish uses subordinate clause word order.

In a subordinate clause, the subject usually comes before the verb:

• när jag bär väskan
• om jag snubblar

So:

• jag = subject
• bär = verb

The order när bär jag väskan would sound like a question: when do I carry the bag?

This is because Swedish main clauses follow the V2 rule: the finite verb must come in the second position.

The sentence starts with a whole clause:

• Om jag snubblar när jag bär väskan

After that fronted clause, the main clause begins, and the finite verb must come first in that clause:

• tappar = finite verb
• jag = subject

So:

• Om jag snubblar när jag bär väskan, tappar jag kanske både nycklarna och mobilen.

If you start directly with the subject, then you get:

• Jag tappar kanske både nycklarna och mobilen om jag snubblar när jag bär väskan.

Both are correct; the word order changes because of V2.

In the main clause, after inversion, the usual order is:

1. finite verb
2. subject
3. sentence adverb such as kanske

So:

• tappar = verb
• jag = subject
• kanske = maybe

That gives:

• tappar jag kanske

If the sentence started with jag, the normal order would be:

• Jag tappar kanske ...

So kanske is in a very normal Swedish position here.

It can mean either, depending on context.

The verb is bära, and it can mean:

• carry
• wear

In this sentence, bär väskan clearly means carry the bag, not wear the bag.

So:

• jag bär väskan = I am carrying the bag

Here it most naturally means drop.

The verb tappa can sometimes overlap with English lose, but in this sentence the physical sense is strongest:

• tappar nycklarna och mobilen = drop the keys and the phone

If you are walking, carrying a bag, trip, and then tappar something, the image is that the objects fall out of your hands or out of the bag.

Swedish often uses the definite form where English might use the, my, or just a context-based noun.

Here the speaker likely means specific things:

• väskan = the bag
• nycklarna = the keys
• mobilen = the phone / mobile phone

In context, these are probably the speaker’s own things, but Swedish does not always need a possessive like my if the situation already makes it clear.

So English might say:

• the bag
• my keys
• my phone

But Swedish can naturally say:

• väskan
• nycklarna
• mobilen

Because nycklar means keys, and nycklarna means the keys.

This is very common because people often talk about a set of keys rather than one key.

Forms:

• en nyckel = a key
• nyckeln = the key
• nycklar = keys
• nycklarna = the keys

So både nycklarna och mobilen means both the keys and the phone.

It means both ... and ...

So:

• både nycklarna och mobilen = both the keys and the phone

This structure is very common in Swedish.

Examples:

• både kaffe och te = both coffee and tea
• både mamma och pappa = both mom and dad

Yes, normally you do.

Swedish usually repeats the subject in each clause:

• Om jag snubblar ... tappar jag ...

Even though it is the same person in both clauses, Swedish does not normally leave out the second jag here.

That is standard and natural.

In modern Swedish, that comma is often optional.

So both of these can be seen:

• Om jag snubblar när jag bär väskan, tappar jag kanske både nycklarna och mobilen.
• Om jag snubblar när jag bär väskan tappar jag kanske både nycklarna och mobilen.

Many writers include the comma to make the sentence easier to read. Others leave it out.

So the comma in your sentence is not strange at all, but Swedish punctuation is often a bit less strict here than English learners expect.

Because bära is an irregular verb.

• infinitive: bära = to carry
• present tense: bär = carry / am carrying

So this is just a verb form you need to learn.

Compare:

• att bära
• jag bär

By contrast, snubbla is regular:

• att snubbla
• jag snubblar

And tappa is regular too:

• att tappa
• jag tappar

Yes. Mobilen is very normal and means the mobile phone / the cellphone.

Related forms:

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

You may also hear:

• telefonen = the phone
• mobiltelefonen = the mobile phone

But mobilen is extremely common in everyday Swedish.

Yes, it is a common everyday verb meaning trip or stumble.

A rough pronunciation guide for an English speaker is:

• snubblar ≈ SNOOB-lar

A few useful notes:

• the u in Swedish is not the same as English oo, but SNOOB-lar is a rough approximation
• stress is on the first syllable: SNUBB-lar

You do not need perfect pronunciation right away, but it is a very useful verb to know.