Die Sekretärin sagt, ich solle die unterschriebenen Unterlagen in die blaue Mappe legen.

solle is Konjunktiv I, which is often used for indirect speech or reported speech in German.

Here, the sentence reports what the secretary says:

• Die Sekretärin sagt, ich solle ... = The secretary says that I am to / should ...

Compare:

• ich soll = normal indicative: I am supposed to
• ich solle = reported speech: she says I am supposed to
• ich sollte = usually Konjunktiv II or sometimes past form, often meaning I should / I ought to / I was supposed to

So solle marks that this is not necessarily the speaker’s own statement, but something being reported.

Yes. This is indirect speech.

Instead of quoting the secretary directly, the sentence reports her instruction.

Direct speech might look like:

• Die Sekretärin sagt: Legen Sie die unterschriebenen Unterlagen in die blaue Mappe.

Indirect speech turns that into:

• Die Sekretärin sagt, ich solle die unterschriebenen Unterlagen in die blaue Mappe legen.

That is why Konjunktiv I appears.

Because the sentence has two clauses:

1. Die Sekretärin sagt
2. ich solle die unterschriebenen Unterlagen in die blaue Mappe legen

In German, when one clause is followed by another clause like this, a comma is required.

So the comma separates:

• the main clause: Die Sekretärin sagt
• the reported clause: ich solle ...

Because sollen is a modal verb, and modal verbs send the main verb to the end in the infinitive.

So:

• ich solle ... legen

This is the same basic pattern as:

• Ich soll die Unterlagen legen → not correct because the infinitive must go to the end
• Correct: Ich soll die Unterlagen in die Mappe legen

In the reported version, the finite modal verb becomes solle, but the structure stays the same:

• ich solle ... legen

This phrase is the direct object of legen, so it is in the accusative.

Noun

Unterlagen is plural, meaning things like documents, papers, or paperwork.

Article

Plural accusative uses die.

Adjective ending

unterschriebenen has the ending -en because:

• it comes after the definite article die
• it modifies a plural noun in the accusative

So:

• die unterschriebenen Unterlagen

The adjective comes from the past participle unterschrieben = signed, but here it is being used like an adjective: the signed documents.

Because in can take either accusative or dative, depending on meaning.

Accusative: movement into something

• in die blaue Mappe
• meaning: into the blue folder

Dative: location inside something

• in der blauen Mappe
• meaning: in the blue folder / inside the blue folder

Since legen means to put/lay something somewhere, it implies movement to a destination, so German uses the accusative:

• in die blaue Mappe legen

If the documents were already there, you would use dative:

• Die Unterlagen sind in der blauen Mappe.

Because Mappe is:

• feminine
• singular
• in the accusative
• with the definite article die

The accusative feminine form of the definite article is still die, and the adjective takes the weak ending -e:

• die blaue Mappe

Compare:

• nominative: die blaue Mappe
• accusative: die blaue Mappe
• dative: der blauen Mappe

So in this sentence, blaue is exactly the right form.

Here, Mappe means something like:

• folder
• file folder
• sometimes portfolio

It does not mean map in the English sense of a geographical map.

That is a very common confusion for English speakers.

So:

• die blaue Mappe = the blue folder

Unterlagen usually means:

• documents
• papers
• paperwork
• supporting documents

It is very common in office, legal, and administrative contexts.

Dokumente also means documents, but Unterlagen often sounds a bit more like a set of papers needed for a task or process.

For example:

• Bitte senden Sie die Unterlagen ein. = Please submit the documents / paperwork.

In this sentence, Unterlagen fits very naturally because it sounds like office paperwork.

Yes. A very common alternative is:

• Die Sekretärin sagt, dass ich die unterschriebenen Unterlagen in die blaue Mappe legen soll.

This version uses:

• dass
• normal verb form soll

That is often more common in everyday German.

The original version with solle is more explicitly marked as reported speech, and can sound more formal, careful, or written.

So both are possible, but they are structured differently:

• ..., ich solle ... → indirect speech with Konjunktiv I
• ..., dass ich ... legen soll → content clause with dass

Because in this kind of reported clause without dass, the conjugated verb usually still stays in second position, just like in a normal main clause.

So the pattern is:

• ich solle ...

Here:

• ich = first element
• solle = second element

If you used dass, the word order would change:

• ..., dass ich ... legen soll

Then the finite verb soll goes to the end of the clause.

So compare:

• Die Sekretärin sagt, ich solle ...
• Die Sekretärin sagt, dass ich ... soll

It started as a verb form, but here it is functioning as an adjective.

The verb is:

• unterschreiben = to sign

Its past participle is:

• unterschrieben = signed

When that participle is placed before a noun, it behaves like an adjective and gets an ending:

• die unterschriebenen Unterlagen

So literally, this is the signed documents.

German does this very often with participles:

• der geschlossene Laden = the closed shop
• die gestohlene Tasche = the stolen bag
• die unterschriebenen Unterlagen = the signed documents

legen is very natural here because it means to lay/put something down, especially something not upright, like papers.

For documents, German commonly uses:

• legen = put/lay
• stecken = put/insert
• sometimes tun in very informal speech, though that is less precise

So you could also hear:

• ... in die blaue Mappe stecken

That would suggest slipping or inserting the documents into the folder.

But legen is perfectly normal and idiomatic here.