Die Lehrerin sagt, jede Schülerin könne mit dem Textmarker die neuen Redewendungen schneller finden.

könne is the Konjunktiv I form of können. German often uses Konjunktiv I for indirect speech or reported speech, especially after verbs like sagen, meinen, or berichten.

So here, Die Lehrerin sagt, jede Schülerin könne ... means the speaker is reporting what the teacher says, rather than simply stating it directly as a fact.

If you used kann, the sentence would sound more like a direct statement of fact: Die Lehrerin sagt, jede Schülerin kann ...

In everyday spoken German, many people do use kann instead of könne, but könne is very normal in formal writing and careful reported speech.

German has two common ways to introduce reported content after sagt:

1. with dass

   • Die Lehrerin sagt, dass jede Schülerin mit dem Textmarker die neuen Redewendungen schneller finden kann.

2. without dass, using Konjunktiv I

   • Die Lehrerin sagt, jede Schülerin könne mit dem Textmarker die neuen Redewendungen schneller finden.

Both are correct. The version without dass is a more compact reported-speech structure, and it often sounds more formal or written.

The comma separates the main clause from the following clause that gives the content of what is being said.

• Main clause: Die Lehrerin sagt
• Reported clause: jede Schülerin könne mit dem Textmarker die neuen Redewendungen schneller finden

In German, this comma is required.

jede means each or every, so it is followed by a singular noun.

That is why German says:

• jede Schülerin = each student / every female student

not:

• jede Schülerinnen ❌

Because the subject is grammatically singular, the verb is singular too, which is another reason you get könne rather than a plural verb form.

If you wanted a plural idea like all the students, you would say: alle Schülerinnen

The ending -in is the regular feminine ending for many nouns referring to people.

• der Lehrer = male teacher

• die Lehrerin = female teacher

• der Schüler = male student
• die Schülerin = female student

Their plurals are:

• die Lehrerinnen
• die Schülerinnen

So this sentence specifically refers to a female teacher and female students.

The preposition mit always takes the dative case.

The noun is:

• der Textmarker = the highlighter

In the dative, der becomes dem:

• mit dem Textmarker = with the highlighter

So this is a standard dative phrase after mit.

It is the accusative plural, because it is the direct object of finden.

The thing being found is:

• die neuen Redewendungen

Breakdown:

• die = plural definite article
• neuen = adjective ending after a definite article
• Redewendungen = plural of Redewendung

In the plural, die is used for both nominative and accusative, so the article itself does not show the difference very clearly here. The verb tells you that this is the object.

Because könne is a modal verb, and in German modal verbs usually send the other verb to the end of the clause in its infinitive form.

So the structure is:

• jede Schülerin = subject
• könne = finite modal verb
• ... finden = infinitive at the end

This is the same pattern you see in a simpler sentence like:

• Jede Schülerin kann die neuen Redewendungen finden.

The only difference here is that kann has become könne because of reported speech.

schneller is the comparative form of schnell, so it means faster or more quickly.

Here it works adverbially, describing how the students find the expressions:

• schnell = fast / quickly
• schneller = faster / more quickly

Unlike English, German usually does not add a special ending like -ly to make an adverb. The same form often works as both adjective and adverb.

So:

• ein schnelles Auto = a fast car
• Sie findet es schnell = she finds it quickly

German word order in the middle of the clause is often flexible. After the finite verb, several elements can move around depending on emphasis, rhythm, and style.

This order is natural:

• jede Schülerin könne mit dem Textmarker die neuen Redewendungen schneller finden

It presents the tool/instrument first, then the object being found.

A different order is also possible, for example:

• jede Schülerin könne die neuen Redewendungen mit dem Textmarker schneller finden

That is still understandable, but the original version sounds very natural. The most important fixed points are:

• könne stays early in the clause
• finden stays at the end

It is correct German, but it sounds a bit more formal or written because of könne.

In everyday spoken German, many people would more likely say:

• Die Lehrerin sagt, dass jede Schülerin mit dem Textmarker die neuen Redewendungen schneller finden kann.

or even:

• Die Lehrerin sagt, jede Schülerin kann mit dem Textmarker die neuen Redewendungen schneller finden.

So the original sentence is not unnatural, but it has a more careful reported-speech style.