Jag lade kvittot i jackfickan.

Lade is the past tense of lägga, which means to lay / to put / to place.

So:

• lägga = to put, to place
• lade = put, placed

In this sentence, Jag lade kvittot i jackfickan means that the action happened in the past.

A very common learner mix-up is:

• lägga → lade = to put something somewhere
• ligga → låg = to be lying somewhere

So:

• Jag lade kvittot i jackfickan = I put the receipt in the jacket pocket.
• Kvittot låg i jackfickan = The receipt was lying in the jacket pocket.

Yes. La is a very common shorter form of the past tense of lägga.

So both are possible:

• Jag lade kvittot i jackfickan
• Jag la kvittot i jackfickan

In general:

• lade sounds a bit more standard or careful
• la is very common in everyday speech and informal writing

As a learner, it is good to recognize both.

Because kvittot is the definite singular form: the receipt.

The noun is:

• ett kvitto = a receipt
• kvittot = the receipt

Swedish usually adds the definite ending to the noun instead of using a separate word like the.

So:

• Jag lade ett kvitto i jackfickan = I put a receipt in the jacket pocket.
• Jag lade kvittot i jackfickan = I put the receipt in the jacket pocket.

Because Swedish often puts definiteness at the end of the noun.

In this sentence:

• kvittot = the receipt
• jackfickan = the jacket pocket

This is very normal Swedish.

Compare:

• en jackficka = a jacket pocket

• jackfickan = the jacket pocket

• ett kvitto = a receipt
• kvittot = the receipt

English uses a separate word, the. Swedish often uses an ending instead.

Because Swedish makes compound nouns very freely.

Jackfickan is built from:

• jacka = jacket
• ficka = pocket

Together:

• jackficka = jacket pocket
• jackfickan = the jacket pocket

This is extremely common in Swedish. English often writes these as two words, but Swedish often joins them into one.

Other examples:

• bilnyckel = car key
• köksbord = kitchen table
• vinterjacka = winter jacket

So jackficka is not strange at all—it is exactly the kind of compound Swedish likes.

I means in here, and it is used because the receipt is placed inside the pocket.

So:

• i jackfickan = in the jacket pocket

That is the natural preposition because a pocket is treated as something you put things into.

Compare:

• på bordet = on the table
• i väskan = in the bag
• i fickan = in the pocket

Yes, you could.

These are both possible:

• i jackfickan
• i fickan på jackan

The first one is more compact and very natural Swedish.
The second one spells the relationship out more directly: in the pocket on the jacket.

In many cases, Swedish prefers the compound noun if it sounds natural, and jackficka definitely does.

Not by itself, no. It just means the jacket pocket.

Whether it is my jacket, your jacket, or some other jacket depends on the context.

If you want to be explicit, you can say:

• i min jackficka = in my jacket pocket
• i hans jackficka = in his jacket pocket

But in Swedish, if the situation is already clear, people often just use the definite form without a possessive.

This is a normal Swedish main-clause pattern:

• Jag = subject
• lade = verb
• kvittot = object
• i jackfickan = place expression

So the structure is:

subject + verb + object + place

That is the most neutral word order here.

A key rule in Swedish is that in a main clause, the finite verb usually comes in second position. That is why if you start with something else, the verb still stays second:

• Igår lade jag kvittot i jackfickan = Yesterday I put the receipt in the jacket pocket.
• I jackfickan lade jag kvittot = In the jacket pocket, I put the receipt.

The original sentence is the most straightforward version.

Both can work, but they have slightly different feels.

• lägga = put/place
• stoppa = put/stick/stuff into

So:

• Jag lade kvittot i jackfickan = I put the receipt in the jacket pocket.
• Jag stoppade kvittot i jackfickan = I put/stuck the receipt into the jacket pocket.

Stoppa can sound a little more like inserting or tucking something into a space.
Lägga is more neutral.

Both are natural, but lade is a very clean, standard choice.

You usually have to learn the gender with the noun:

• ett kvitto
• en jackficka

That matters because it affects the indefinite article and the definite ending:

For ett nouns:

• ett kvitto
• kvittot

For en nouns:

• en jackficka
• jackfickan

There is not always a perfect rule that lets you predict the gender, so it is best to learn nouns together with en or ett from the beginning.

In everyday speech, many speakers would say something very close to:

• Jag la kvittot i jackfickan

Also, jag is often pronounced less carefully in speech, sometimes closer to ya than a fully clear written-style pronunciation.

So a natural spoken version may sound more relaxed than the spelling suggests, but the written sentence Jag lade kvittot i jackfickan is completely standard and correct.