Μιλάει με τόση ευκολία, που όλοι νομίζουν ότι μαθαίνει ελληνικά εδώ και πολλά χρόνια.

Μιλάει is the 3rd person singular present tense of μιλάω / μιλώ, meaning he/she speaks or he/she is speaking.

In this sentence, Greek leaves out the subject pronoun, so Μιλάει by itself means:

• he speaks
• she speaks

depending on context.

You may also see μιλά instead of μιλάει. Both are common.
So:

• μιλάει = μιλά
• both mean he/she speaks

Greek very often drops subject pronouns when the verb ending already shows the person and number.

So instead of saying:

• Αυτός μιλάει... = He speaks...
• Αυτή μιλάει... = She speaks...

Greek usually just says:

• Μιλάει...

because the verb form already tells you it is 3rd person singular.

The exact subject, he or she, is understood from context.

με τόση ευκολία literally means with so much ease or with such ease.

Breakdown:

• με = with
• τόση = so much / such
• ευκολία = ease

So the phrase means that someone speaks in an easy, effortless, fluent way.

In natural English, you might translate it as:

• with such ease
• so easily
• so effortlessly

Greek often uses με + noun where English might prefer an adverb.

Because τόση agrees with ευκολία, which is a feminine singular noun.

The word τόσος / τόση / τόσο changes form to match the noun:

• masculine: τόσος
• feminine: τόση
• neuter: τόσο

Since ευκολία is feminine, Greek uses τόση.

So:

• τόση ευκολία = such ease

If the noun were neuter, you would use τόσο instead.

This is a very common Greek structure meaning so ... that or such ... that.

Here:

• με τόση ευκολία = with such ease
• που όλοι νομίζουν... = that everyone thinks...

So the full pattern is:

• τόση ... που ... = such ... that ...

It expresses a result:

• He/She speaks with such ease
• that everyone thinks...

Very similar patterns are:

• τόσο ... που ... = so ... that ...
• τόσος/τόση/τόσο ... που ... = such ... that ...

Here, που is a conjunction, not a relative pronoun.

In this sentence, it means:

• that
• or more specifically, it introduces the result clause after τόση

So:

• Μιλάει με τόση ευκολία, που...
• He/She speaks with such ease, that...

Greek που can do several different jobs, so yes, it is also used in other kinds of sentences, including relative clauses. But here it simply connects the result: so/such ... that.

Because the part after που is a separate clause giving the result of the first clause.

So Greek writes:

• Μιλάει με τόση ευκολία, που όλοι νομίζουν...

The comma helps separate:

1. the main statement
2. the consequence/result

In English, we often do the same with so/such ... that structures, though punctuation can vary.

They introduce different clauses.

1. που

In Μιλάει με τόση ευκολία, που..., που means that in the sense of so/such ... that. It introduces a result.

2. ότι

In όλοι νομίζουν ότι..., ότι means that after a verb of thinking/saying.

So:

• που = introduces the result of speaking so easily
• ότι = introduces what everyone thinks

In English:

• He speaks with such ease, that everyone thinks that...

The two that words do different jobs, and Greek shows that difference clearly.

όλοι means everyone / all people, and νομίζουν is the 3rd person plural of νομίζω (to think, believe).

So literally:

• όλοι = all
• νομίζουν = they think

Together, this gives:

• everyone thinks
• or more literally, all people think

Greek often uses όλοι in this way where English prefers everyone.

Because the sentence is talking about what people assume about the person’s history, not just repeating that the person speaks Greek.

μαθαίνει ελληνικά means:

• is learning Greek
• and in this context, with εδώ και πολλά χρόνια, effectively has been learning Greek for many years

The idea is:

• this person speaks so well
• that people think they have been studying/learning Greek for a long time

If Greek said μιλάει ελληνικά εδώ και πολλά χρόνια, that would mean has been speaking Greek for many years, which is a slightly different idea.

This is one of the most important things to notice.

Greek often uses the present tense with εδώ και + time expression to describe an action that:

• started in the past
• continues up to now

So:

• μαθαίνει ελληνικά εδώ και πολλά χρόνια

means:

• he/she has been learning Greek for many years
• or he/she has been learning Greek for a long time

This is different from English, which normally uses the present perfect continuous.

So the Greek present tense here does work that English often gives to has been learning.

εδώ και πολλά χρόνια means for many years.

Breakdown:

• εδώ και = a fixed expression meaning for when talking about duration up to the present
• πολλά χρόνια = many years

So:

• μαθαίνει ελληνικά εδώ και πολλά χρόνια
• he/she has been learning Greek for many years

Do not try to translate εδώ here as normal here. In this expression, εδώ και functions together as a set phrase meaning for (a period of time).

Other examples:

• Μένω εδώ και δύο μήνες στην Αθήνα.
  I have been living in Athens for two months.

• Τον ξέρω εδώ και χρόνια.
  I have known him for years.

Yes, ελληνικά means Greek as a language, even though the form is neuter plural.

Greek names for languages are often expressed this way:

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

So μαθαίνει ελληνικά simply means:

• he/she is learning Greek

Even though the form looks plural, in meaning it refers to the language as a whole.

Yes, Greek could express a similar idea with an adverb, but με τόση ευκολία is very natural and expressive.

For example:

• Μιλάει πολύ εύκολα = He/She speaks very easily

But that is not exactly the same in tone.

Difference in feel:

• με τόση ευκολία = with such ease → more elegant, more emphatic
• πολύ εύκολα = very easily → simpler, more direct

The original sentence sounds more like He/She speaks with such ease..., which sets up the που result clause nicely.

Not exactly.

ευκολία means:

• ease
• effortlessness
• facility

So μιλάει με τόση ευκολία suggests the person speaks in a very natural, effortless way.

That often implies fluency, but it is not literally the same word as fluency.

A more direct idea of fluency would involve words like:

• ευχέρεια
• or phrases about speaking άπταιστα (fluently)

But in this sentence, ευκολία works very naturally to convey the impression of strong speaking ability.

Yes, in many cases Greek can omit ότι after verbs like νομίζω, especially in everyday speech.

So both of these are possible:

• όλοι νομίζουν ότι μαθαίνει ελληνικά εδώ και πολλά χρόνια
• όλοι νομίζουν μαθαίνει ελληνικά εδώ και πολλά χρόνια (less formal / more colloquial feel)

However, using ότι is clear and standard, especially in writing. In this sentence, it helps mark the start of the content clause very neatly.

The sentence has three layers:

1. Main clause

• Μιλάει με τόση ευκολία
• He/She speaks with such ease

2. Result clause introduced by που

• που όλοι νομίζουν...
• that everyone thinks...

3. Content clause introduced by ότι

• ότι μαθαίνει ελληνικά εδώ και πολλά χρόνια
• that he/she has been learning Greek for many years

So the logic is:

• Someone speaks very easily
• as a result, everyone thinks
• that this person has been learning Greek for many years

That layered structure is very common in Greek and worth getting comfortable with.