Δεν μου αρέσει να παρεμβαίνω όταν δύο άνθρωποι συζητούν ήρεμα, αλλά παρεμβαίνω αν ο τσακωμός γίνει μεγάλος.

Because αρέσει works like is pleasing to in Greek.

So:

• μου αρέσει = it pleases me / I like it
• σου αρέσει = it pleases you
• του/της αρέσει = it pleases him/her

The person who experiences the liking goes in the genitive weak pronoun:

• μου = to me
• σου = to you
• του/της = to him/her

So Greek does not structure this like English I like.... It structures it more like ...is pleasing to me.

After αρέσει, Greek often uses να + verb to express liking an action.

• Μου αρέσει να διαβάζω = I like reading / I like to read
• Μου αρέσει να παρεμβαίνω = I like to intervene

So να παρεμβαίνω is a subordinate verb phrase meaning to intervene / intervening.

This is very common after verbs and expressions such as:

• θέλω να...
• μπορώ να...
• πρέπει να...
• μου αρέσει να...

This is about aspect, which is very important in Greek.

• παρεμβαίνω = imperfective aspect
  Focus on the action as a process, repeated action, or general activity.
• παρέμβω = perfective subjunctive form
  Focus on a single, complete intervention.

Here, μου αρέσει να παρεμβαίνω means something like I like intervening or I like to step in as a general behavior. That is why the imperfective form fits better.

If you said μου αρέσει να παρέμβω, it would sound much less natural in this context because it points more toward one completed intervention rather than a general habit or tendency.

The two instances do different jobs:

1. Δεν μου αρέσει να παρεμβαίνω...
   Here it is inside a να-clause, connected to μου αρέσει.

2. ...αλλά παρεμβαίνω αν...
   Here it is the main verb of the second clause: but I do intervene if...

So the first means to intervene / intervening as an action being talked about, while the second states an actual present/general action: I intervene.

Both are correct.

• συζητούν
• συζητάνε

These are two common 3rd person plural present forms in Modern Greek. Συζητούν is often felt to be a bit more neutral or slightly more formal in writing, while συζητάνε is very common in speech.

So in this sentence, συζητούν simply means they are discussing / they discuss.

Because this sentence describes a general situation or habitual pattern.

• όταν δύο άνθρωποι συζητούν ήρεμα = when two people are talking calmly

The speaker is not referring to one specific conversation at one exact moment. It means whenever this situation happens.

Greek often uses the present tense with όταν for repeated or general situations.

They mean different things:

• όταν = when, for a situation seen as occurring
• αν = if, for a condition

So:

• όταν δύο άνθρωποι συζητούν ήρεμα = when two people are discussing calmly
• αν ο τσακωμός γίνει μεγάλος = if the argument becomes serious/big

In other words:

• όταν introduces the circumstance
• αν introduces the condition for intervening

Because after αν referring to a possible future situation, Greek commonly uses the subjunctive-type form with the perfective stem, here γίνει.

• γίνει = from γίνομαι
• It refers to if it becomes / if it gets

This is a very common Greek pattern:

• αν έρθει = if he comes
• αν βρέξει = if it rains
• αν γίνει = if it becomes / if it happens

Using γίνεται would suggest a more ongoing, regular process and would not fit as naturally here. The speaker means if the quarrel reaches that point, a single threshold or change of state.

Because forms like γίνει, έρθει, βρει, πει are often used after words such as αν, όταν, μόλις, πριν in environments that call for the subjunctive/perfective idea, even when να itself is not present.

So γίνει is the form Greek uses here after αν to express a possible future outcome:

• αν γίνει = if it becomes / if it happens

This is something learners often need to get used to: Greek does not always need an explicit να for this kind of form to appear.

Because μεγάλος agrees with ο τσακωμός, which is masculine singular.

• ο τσακωμός = masculine singular
• so the adjective is μεγάλος

Agreement in Greek usually matches the noun in gender, number, and case.

Compare:

• ο τσακωμός είναι μεγάλος
• η ένταση είναι μεγάλη
• το πρόβλημα είναι μεγάλο

Here μεγάλος is a predicate adjective after γίνει:
the quarrel becomes serious/big.

Because δύο άνθρωποι is the subject of συζητούν, so it is in the nominative plural.

• singular: ο άνθρωπος
• plural nominative: οι άνθρωποι

After numbers, Greek still uses the normal noun forms required by the sentence. Since these two people are the subject, άνθρωποι is correct.

Because ήρεμα here is an adverb, not an adjective.

• ήρεμος, ήρεμη, ήρεμο = calm
• ήρεμα = calmly

It describes how they are discussing:

• συζητούν ήρεμα = they discuss calmly

If you used ήρεμοι, that would describe the people themselves:

• οι άνθρωποι είναι ήρεμοι = the people are calm

But in the sentence, the focus is on the manner of discussion, so the adverb ήρεμα is needed.

Παρεμβαίνω means I intervene, I step in, or I interfere, depending on context.

In this sentence, it most naturally means step in / intervene.

The verb can sometimes sound:

• neutral: intervene
• helpful/protective: step in
• unwanted: interfere

Here the contrast suggests:
I do not like stepping in when people are calmly discussing, but I do step in if the fight gets serious.

So the tone is more intervene than interfere.

Yes, it is much stronger.

• συζήτηση = discussion
• τσακωμός = quarrel, fight, argument

The sentence contrasts a calm discussion with a more serious conflict:

• συζητούν ήρεμα = they are discussing calmly
• ο τσακωμός γίνει μεγάλος = the quarrel gets serious / becomes a big fight

So the speaker is saying they avoid intervening in normal calm discussion, but they intervene when it turns into a serious argument.

Because the negation applies only to the first main idea:

• Δεν μου αρέσει να παρεμβαίνω... = I do not like to intervene...
• αλλά παρεμβαίνω... = but I do intervene...

This creates a clear contrast:

• I don't like doing it
• but I do it under certain conditions

Greek, like English, does not need to repeat the negative in the second clause unless the second clause is also negative.

Because δεν normally comes directly before the verb:

• Δεν αρέσει
• Δεν θέλω
• Δεν μπορώ

Clitic pronouns like μου often come before the verb too, so the natural order is:

• Δεν μου αρέσει

This is the normal and idiomatic placement.

Literally, yes, it is becomes big, but in Greek μεγάλος often has a broader meaning than physical size.

With something like τσακωμός, μεγάλος can mean:

• serious
• major
• intense
• big

So αν ο τσακωμός γίνει μεγάλος means something like:

• if the quarrel gets serious
• if the argument becomes major
• if the fight escalates

It is not about physical size; it is about intensity or seriousness.