Η δασκάλα δεν αμφιβάλλει ότι προχωράς στα ελληνικά.

In Greek, nouns usually take a definite article much more often than in English. So Η δασκάλα literally means the teacher.

In this sentence, η is the feminine singular form of the, and δασκάλα means female teacher.

Depending on context, English might translate this as:

• The teacher
• Your teacher
• The teacher says...

But in Greek, using the article here is completely normal.

Yes. δασκάλα is specifically a female teacher.

The masculine form is δάσκαλος = male teacher.

So:

• η δασκάλα = the female teacher
• ο δάσκαλος = the male teacher

Greek marks grammatical gender much more clearly than English does.

Word for word:

• δεν = not
• αμφιβάλλει = doubts / is doubting

So δεν αμφιβάλλει literally means does not doubt.

In natural English, that often becomes:

• doesn’t doubt
• has no doubt
• is sure

So the sentence expresses confidence, not uncertainty.

δεν is the normal negation used with indicative verbs, meaning ordinary statements and facts.

Here, the sentence is a normal statement:

• Η δασκάλα δεν αμφιβάλλει... = The teacher does not doubt...

A very important contrast is:

• δεν for indicative statements
• μη(ν) for subjunctive, commands, or certain non-indicative forms

So here δεν is exactly what you would expect.

αμφιβάλλει is the third person singular present form of αμφιβάλλω = to doubt.

That means it matches η δασκάλα = she / the teacher.

So:

• εγώ αμφιβάλλω = I doubt
• εσύ αμφιβάλλεις = you doubt
• αυτός/αυτή αμφιβάλλει = he/she doubts

Here, η δασκάλα is singular, so αμφιβάλλει is singular too.

ότι means that and introduces a clause.

So:

• Η δασκάλα δεν αμφιβάλλει ότι... = The teacher doesn’t doubt that...

It connects the main idea (doesn’t doubt) to the content of that belief (you are making progress in Greek).

In many cases, ότι can be replaced by πως with little or no difference:

• Η δασκάλα δεν αμφιβάλλει ότι προχωράς...
• Η δασκάλα δεν αμφιβάλλει πως προχωράς...

Both are natural.

No. They are different words.

• ότι = that
• ό,τι = whatever / anything that

In your sentence, it is ότι = that.

Compare:

• Ξέρω ότι έρχεται. = I know that he is coming.
• Πάρε ό,τι θέλεις. = Take whatever you want.

That little comma matters in writing.

προχωράς is the second person singular present form of προχωράω / προχωρώ.

So it means:

• you move forward
• you progress
• you are making progress

Because Greek verb endings already show the subject, Greek does not need to say εσύ here.

So:

• προχωράς already means you progress / you are progressing

That is why there is no separate word for you in the sentence.

Yes, literally προχωράς means you move forward or you go ahead.

But it is also commonly used in a more general sense:

• to make progress
• to advance
• to improve

So in a learning context, προχωράς στα ελληνικά means:

• you are making progress in Greek
• you are advancing in Greek

This is a very natural use of the verb in Greek.

στα is a contraction of:

• σε = in / to / at
• τα = the

So:

• σε + τα = στα

That means στα ελληνικά is literally something like in the Greek.

This is normal Greek structure.

When Greek names languages in everyday use, it often uses the neuter plural form with the article:

• τα ελληνικά = Greek
• τα αγγλικά = English
• τα γαλλικά = French

So στα ελληνικά means in Greek or in the Greek language.

This can feel strange to English speakers because English does not usually use an article or plural form for languages. But in Greek, this is standard.

A more formal or explicit version would be:

• στην ελληνική γλώσσα = in the Greek language

But στα ελληνικά is the normal everyday way to say it.

It means both, depending on context.

In this sentence, προχωράς στα ελληνικά means you are making progress in Greek.

In other sentences, στα ελληνικά can also mean in Greek, as in the language being spoken or written:

• Το είπε στα ελληνικά. = He said it in Greek.

So the exact English translation depends on the situation, but the Greek expression is the same.

Greek often leaves out subject pronouns because the verb ending already tells you who the subject is.

Here:

• προχωράς = you progress / you are making progress

So Greek does not need εσύ unless the speaker wants emphasis or contrast.

For example:

• Εσύ προχωράς, αλλά αυτός όχι. = You are making progress, but he isn’t.

Without emphasis, just προχωράς is enough.

Then προχωράς would become προχωράτε.

So the sentence would be:

• Η δασκάλα δεν αμφιβάλλει ότι προχωράτε στα ελληνικά.

That can mean:

• you all are making progress in Greek or
• you are making progress in Greek (formal singular)

Greek uses the same verb form for plural you and formal singular you.

Yes, usually it is stronger.

• νομίζει ότι... = she thinks that...
• δεν αμφιβάλλει ότι... = she doesn’t doubt that...

The second one suggests much more confidence and certainty.

So this sentence does not just mean the teacher has an opinion. It means she feels quite sure that you are making progress.