Μιλάς τόσο γρήγορα που δεν καταλαβαίνω τίποτα.

You speak so fast that I don’t understand anything.

Breakdown of Μιλάς τόσο γρήγορα που δεν καταλαβαίνω τίποτα.

• μιλάω: to speak
• δεν: not
• καταλαβαίνω: to understand
• γρήγορα: fast
• τίποτα: anything
• τόσο ... που: so ... that

Questions & Answers about Μιλάς τόσο γρήγορα που δεν καταλαβαίνω τίποτα.

What does μιλάς mean grammatically, and what is its dictionary form?

Μιλάς is the 2nd person singular form of the verb μιλάω / μιλώ (to speak / to talk) in the present tense.

• Dictionary form: μιλάω (also μιλώ, a slightly more formal/shorter variant)
• Conjugation (present, singular): μιλάω/μιλώ (I speak), μιλάς (you speak), μιλάει/μιλά (he/she/it speaks)

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Why is there no word for you in the sentence?

Greek usually doesn’t need subject pronouns because the verb ending shows who the subject is. μιλάς already means you speak, so εσύ (you) is optional.
You might add εσύ only for emphasis/contrast: Εσύ μιλάς τόσο γρήγορα... = You (specifically) speak so fast...

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Is this μιλάς informal? How would I say it politely/formally?

Yes, μιλάς addresses one person informally (like you singular in English).
For polite/formal you, Greek uses 2nd person plural:

• Μιλάτε τόσο γρήγορα που δεν καταλαβαίνω τίποτα. (polite to one person, or to several people)

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What is the role of τόσο here? Is it an adjective or an adverb?

Here τόσο means so / that in the sense of to such a degree, and it functions like an adverb of degree modifying γρήγορα (quickly).
So the pattern is: τόσο + adverb/adjective + που + result.

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How does the τόσο ... που ... structure work?

τόσο ... που ... expresses a cause → result relationship:

• Cause/intensity: Μιλάς τόσο γρήγορα = You speak so fast
• Result: που δεν καταλαβαίνω τίποτα = that I don’t understand anything

It’s a very common everyday way to say so … that ….

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Why is που used here? Does it mean that, who, or where?

που has several uses in Greek, but here it introduces a result clause after τόσο and is best understood as that (as in so … that …).
So in this sentence που = that (result), not who/which/where.

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Could I use ώστε instead of που?

Often, yes, but it changes the style slightly.

• τόσο ... που ... is very common and conversational.
• ώστε can sound a bit more “structured” and is also used for result:
  Μιλάς τόσο γρήγορα, ώστε δεν καταλαβαίνω τίποτα.
  Both are possible; που is usually the more natural default in speech.

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What is γρήγορα exactly, and why not γρήγορος/γρήγορη/γρήγορο?

γρήγορα is the adverb meaning quickly/fast.
The forms γρήγορος/γρήγορη/γρήγορο are adjectives meaning fast/quick and must describe a noun (e.g., ένας γρήγορος ρυθμός = a fast pace).
Because it describes how someone speaks, Greek uses the adverb: μιλάς γρήγορα.

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Why does Greek use δεν for negation here?

δεν is the standard negation word used with the indicative (statements of fact) in most tenses:

• δεν καταλαβαίνω = I don’t understand

You’ll also see μη(ν) in other contexts (commands, wishes, certain subjunctive uses), but for a plain statement like this, δεν is correct.

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What does καταλαβαίνω mean grammatically, and why is it in the present tense?

καταλαβαίνω is 1st person singular present: I understand.
Greek present tense often covers what English expresses as present simple or present continuous, depending on context. Here it’s a general/ongoing situation: I can’t understand (as you’re speaking).

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Why does Greek say δεν καταλαβαίνω τίποτα (double negative)? Wouldn’t τίποτα already be negative?

In Greek, words like τίποτα (anything) are typically used with negation to mean nothing. This is normal Greek grammar, not “incorrect double negative” like in standard English.

• δεν ... τίποτα = nothing / anything at all
  So δεν καταλαβαίνω τίποτα = I don’t understand anything / I understand nothing.

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Can τίποτα ever mean anything in a positive sentence?

Yes. Without negation (or in questions/conditionals), τίποτα can mean anything depending on context. For example:

• Κατάλαβες τίποτα; = Did you understand anything?
  But in a negative statement like this, it naturally becomes nothing/anything at all.

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Is the word order flexible? Could I move τίποτα or τόσο γρήγορα?

Greek word order is somewhat flexible, but some placements are more natural.
Common variants include:

• Μιλάς τόσο γρήγορα που δεν καταλαβαίνω τίποτα. (neutral)
• Μιλάς τόσο γρήγορα που τίποτα δεν καταλαβαίνω. (more emphatic/literary; emphasizes nothing)
  Moving parts changes emphasis, but the original sentence is the most straightforward everyday order.

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How is the sentence pronounced and where is the stress?

Stress is shown by the accent marks and is essential in Greek:

• Μιλάς (stress on -λάς)
• τόσο (stress on τό-)
• γρήγορα (stress on γρή-)
• δεν (usually unstressed/short)
• καταλαβαίνω (stress on -βαί-)
• τίποτα (stress on τί-)