Οφείλεις να μιλάς με σεβασμό, ακόμα κι αν διαφωνείς.

Οφείλεις is the 2nd person singular form of οφείλω.

In this sentence, it means something like:

• you must
• you ought to
• you are obliged to

Literally, οφείλω can also mean to owe, but here it expresses duty/obligation, not money or debt.

So Οφείλεις να... is a fairly strong way to say that someone has a responsibility to do something.

In Greek, να is used before a verb to introduce what English learners often think of as a subjunctive-type construction.

So:

• Οφείλεις να μιλάς = You must speak / You ought to speak

After verbs like οφείλω, θέλω, πρέπει, μπορώ, Greek commonly uses να + verb.

You do not say Οφείλεις μιλάς. The να is required here.

This is a very common Greek aspect question.

Greek often distinguishes between:

• imperfective / continuous aspect: να μιλάς
• perfective / one-time / bounded aspect: να μιλήσεις

Here, να μιλάς suggests:

• speaking in general
• speaking habitually
• speaking in the manner you should normally speak

So the sentence means something like:

• You should speak respectfully
• You should always speak with respect

If you said να μιλήσεις, it could sound more like a single act or occasion:

• You should speak (once / at a certain moment)

In this sentence, the general rule or ongoing behavior is the point, so μιλάς fits better.

Μιλάς is the 2nd person singular form of μιλάω / μιλώ.

It means:

• you speak
• you are speaking
  depending on context

In να μιλάς, it is not just a simple present in the English sense. It is the imperfective subjunctive-type form after να.

So grammatically, it is the form Greek uses to talk about an ongoing, repeated, or general action after να.

Greek often uses a prepositional phrase where English might prefer an adverb.

So:

• με σεβασμό = literally with respect
• natural English translation = respectfully or with respect

This is very idiomatic Greek.

You may also hear adverbs in Greek, but με + noun is extremely common and natural:

• με χαρά = with joy / gladly
• με προσοχή = carefully, with care
• με σεβασμό = respectfully, with respect

So this is not strange Greek at all; it is a very normal structure.

Ακόμα κι αν means even if.

It introduces a contrast:

• You must speak respectfully, even if you disagree.

A few notes:

• ακόμα = still / yet / even
• κι is a shortened form of και
• αν = if

So ακόμα κι αν is a fixed expression meaning even if.

You will also see:

• ακόμα και αν
• ακόμη κι αν
  These are essentially equivalent, with small stylistic/spelling variation.

Κι is a very common shortened form of και.

So:

• κι = and
• και = and

Before a vowel, especially in everyday speech and writing, κι is often preferred because it sounds smoother.

That means:

• ακόμα κι αν
• ακόμα και αν

both mean the same thing.

In this sentence, κι αν is just the more compact, very natural version.

Διαφωνείς comes from διαφωνώ, which means:

• to disagree
• to have a different opinion

Διαφωνείς is the 2nd person singular present form:

• you disagree

So:

• αν διαφωνείς = if you disagree

It matches the singular you used earlier in Οφείλεις and μιλάς.

In Greek, after αν, the present tense is commonly used for real or possible situations like this.

So:

• αν διαφωνείς = if you disagree

It refers to a general condition, not necessarily a future-only event.

The whole sentence gives a general rule:

• whenever you disagree, you should still speak respectfully

This is very natural Greek.

Yes, often it is.

Compare:

• Οφείλεις να μιλάς με σεβασμό
• Πρέπει να μιλάς με σεβασμό

Both can mean You should / must speak respectfully, but:

• πρέπει is more common in everyday speech for must / should
• οφείλεις can sound a bit more formal, moral, or principled
• οφείλεις often suggests you have a duty

So this sentence has a slightly elevated tone, as if stating a principle of proper behavior.

Yes, but normally it is omitted.

Greek usually does not need the subject pronoun because the verb ending already shows who the subject is:

• Οφείλεις = you owe / must
• μιλάς = you speak
• διαφωνείς = you disagree

So the sentence naturally appears without εσύ.

If you add εσύ, it gives emphasis or contrast:

• Εσύ οφείλεις να μιλάς με σεβασμό...

That might sound like:

• You, in particular, should speak respectfully...

So the version without εσύ is the neutral one.

For plural or formal/polite you, Greek uses the 2nd person plural:

• Οφείλετε να μιλάτε με σεβασμό, ακόμα κι αν διαφωνείτε.

Changes:

• Οφείλεις → Οφείλετε
• μιλάς → μιλάτε
• διαφωνείς → διαφωνείτε

This can mean either:

• you all should speak respectfully or
• you should speak respectfully addressed politely to one person

The comma separates the main statement from the subordinate clause:

• main clause: Οφείλεις να μιλάς με σεβασμό
• subordinate clause: ακόμα κι αν διαφωνείς

This is similar to English punctuation in:

• You must speak respectfully, even if you disagree.

The comma helps mark the contrast clearly and is very natural here.

It is absolutely natural Greek, but it has a slightly formal or admonitory tone.

It sounds like something you might hear:

• in advice about behavior
• in a school or workplace context
• in a serious conversation about manners
• in writing, speeches, or public discourse

A more casual everyday version might be:

• Πρέπει να μιλάς με σεβασμό, ακόμα κι αν διαφωνείς.

But the original sentence is fully normal and idiomatic.

Even if the meaning has already been given, a learner may still wonder about the tone.

The sentence most naturally conveys:

• You should speak respectfully, even if you disagree.
• You must speak with respect, even when you disagree.

The Greek sounds like a statement of principle:

• disagreement does not justify rude speech

So the tone is not just grammatical obligation; it also carries a moral or social expectation.