Η φίλη μου παραδέχεται εύκολα όταν δεν ξέρει κάτι, και αυτό μου αρέσει πολύ.

Greek normally uses the definite article with possessive expressions like this.

So:

• η φίλη μου = my friend
• literally: the friend of me

This is one of the most common differences from English. In English, my replaces the, but in Greek the article usually stays.

Also, η shows that φίλη is feminine singular nominative.

It can mean either, depending on context.

• φίλη = female friend
• φίλη can also mean girlfriend

Greek often relies on context here, just like English sometimes does with my friend vs my girlfriend. If the meaning shown to the learner is friend, then that is the intended sense in this sentence.

Greek often leaves out subject pronouns when they are not needed, because the verb ending already tells you the person and number.

Here:

• παραδέχεται = he/she admits

So Greek does not need to say αυτή for she unless it wants extra emphasis or contrast.

This is very normal in Greek and is one of the first things English speakers notice.

Good question. The verb is παραδέχομαι, which is one of those Greek verbs that has middle/passive-style forms but an active meaning.

So:

• παραδέχομαι = I admit
• παραδέχεται = he/she admits

Even though the form looks like a passive form to an English speaker, here it does not mean is admitted. It simply means admits.

This kind of verb is very common in Modern Greek, so it is worth getting used to it early.

Literally, yes, εύκολα means easily, but in this sentence a more natural English sense is often readily or without difficulty/hesitation.

So the idea is not that admitting is physically easy. It means she is willing to admit it openly.

εύκολα is an adverb, formed from εύκολος = easy.

Because this sentence describes a general or habitual situation.

Here the meaning is like:

• when/whenever she doesn’t know something

In Greek, όταν can be followed by the present when you are talking about something that happens regularly or generally.

Compare the idea:

• Όταν δεν ξέρει κάτι, το παραδέχεται.
  = Whenever she doesn’t know something, she admits it.

So the present tense fits the repeated, general meaning.

This is a very useful distinction.

• δεν ξέρει κάτι = there is something she doesn’t know
• δεν ξέρει τίποτα = she knows nothing

So κάτι is used because the sentence means she does not know some particular thing. It does not mean that she knows absolutely nothing.

In English, doesn’t know something can sound a little unusual on its own, but in Greek this structure is perfectly natural in this kind of sentence.

Αυτό refers to the whole previous idea, not just to one noun.

So it means something like:

• that fact
• that behavior
• that quality

Specifically, it refers to the fact that she easily admits when she does not know something.

This is very common in Greek: αυτό can point back to an entire clause or situation.

Greek αρέσει works differently from English like.

English says:

• I like that

Greek literally works more like:

• That is pleasing to me

So in:

• αυτό μου αρέσει πολύ

the parts are:

• αυτό = that → the grammatical subject
• μου = to me
• αρέσει = is pleasing / pleases
• πολύ = very much / a lot

So μου here is not possessive. It is an indirect object pronoun meaning to me.

It is the same form, but it has two different functions.

1. In η φίλη μου, μου is possessive:

   • my friend
   • literally the friend of me

2. In μου αρέσει, μου means to me:

   • that pleases me
   • literally to me

So the word μου can mean either my or to me, depending on how it is used.

Because that is a very natural position in Greek.

• αυτό μου αρέσει πολύ = I like that very much

Greek word order is flexible, but the end position often sounds natural for adverbs like πολύ. It gives a smooth, ordinary sentence rhythm.

You could move things around in some contexts for emphasis, but this version is standard and neutral.

Because και here connects two full clauses:

• Η φίλη μου παραδέχεται εύκολα όταν δεν ξέρει κάτι
• αυτό μου αρέσει πολύ

Since the second part is a separate complete thought, the comma is natural and helps readability.

In short, the comma marks a pause between:

• the statement about the friend, and
• the speaker’s reaction to it.