Efter regnet låg våta löv på gräsmattan, så jag tog en spade från förrådet.

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

• Efter regnet is the first element.
• So the finite verb låg must come second.
• The subject våta löv comes after the verb.

So the pattern is:

• Efter regnet | låg | våta löv | på gräsmattan

This kind of inversion is very common in Swedish when you start with a time phrase, place phrase, or other adverbial.

Regnet is the definite form, meaning the rain.

Here, the speaker is referring to a specific rain event that has just happened, so Swedish naturally uses the definite form:

• efter regnet = after the rain

If you said efter regn, it would sound more general, more like after rain as a phenomenon rather than after that particular rainfall.

Swedish often prefers a position verb where English would simply use be.

Here, ligga means lie or be lying, and it is used for things resting on a surface. Leaves on a lawn are thought of as lying there, so:

• löven låg på gräsmattan = the leaves were lying on the lawn

Compare some common Swedish position verbs:

• ligga = lie
• stå = stand
• sitta = sit

English often just says be, but Swedish is more specific.

Because Swedish verbs do not change according to person or number.

The past tense form låg is used whether the subject is singular or plural:

• bladet låg = the leaf lay
• löven låg = the leaves lay

So unlike English, Swedish does not have a separate plural past form here.

Here löv is plural.

That can be confusing because the noun löv has the same form in both singular indefinite and plural indefinite:

• ett löv = a leaf
• löv = leaves

You can tell it is plural here because of the adjective:

• våta löv = wet leaves

If it were singular, it would be:

• ett vått löv = a wet leaf

Because the adjective has to agree with the noun.

For våt:

• våt = singular, common gender
• vått = singular, neuter
• våta = plural

Since löv is plural here, the adjective must be våta:

• våta löv = wet leaves

In Swedish, indefinite plural nouns usually do not take an article.

So:

• våta löv = wet leaves

This is normal. Swedish does not need a word like some unless you specifically want that meaning:

• några våta löv = some wet leaves

Without några, it is just an indefinite plural phrase.

Because Swedish usually puts the definite article at the end of the noun.

• gräsmatta = lawn
• gräsmattan = the lawn

So på gräsmattan means on the lawn.

This is one of the big differences from English: instead of a separate word like the, Swedish often uses a suffix.

Here så means so or therefore.

It links the two parts of the sentence:

• first: wet leaves were on the lawn
• result: the speaker took a shovel

So it works like:

• ..., så jag tog en spade ...
• ..., so I took a shovel ...

In this sentence, så is acting as a coordinating conjunction, like and, but, or so in English.

After a coordinating conjunction, the new clause normally keeps ordinary main-clause order:

• jag tog = I took

So:

• ..., så jag tog en spade ...

If you wrote så tog jag ..., that would usually mean then I took ... or give så a more adverb-like role in first position. That is a different structure.

Because the shovel is being introduced as one unspecified shovel, not a specific previously known one.

• en spade = a shovel
• spaden = the shovel

Since the sentence does not assume the listener already knows which shovel, the indefinite form is natural.

Because it refers to a specific storage place that is understood in the situation.

• förråd = storage room / shed / utility storage
• förrådet = the storage room / the shed

So från förrådet means from the shed / from the storage room.

Swedish often uses the definite form when the place is identifiable from context, even if English might not always stress that as much.

The comma separates two main clauses:

• Efter regnet låg våta löv på gräsmattan
• så jag tog en spade från förrådet

In Swedish, a comma before a conjunction like så is often used for clarity, especially when the clauses are fairly long. It helps the sentence read more smoothly.

So the comma is natural and helpful here.