Περπατάω σιγά σιγά γιατί πονάει το γόνατό μου.

Περπατάω is 1st person singular, present tense of περπατάω / περπατώ.

In Modern Greek, the present tense can cover both:

• I walk
• I am walking

So this form does not force a difference between simple present and progressive the way English often does. Context tells you which is more natural.

Also, Greek usually does not need the subject pronoun εγώ (I), because the verb ending already shows the subject.

Yes. Περπατάω and περπατώ are two common forms of the same verb, both meaning I walk / I am walking.

A learner will often see this kind of pair in Greek:

• -άω form: περπατάω
• -ώ form: περπατώ

Both are standard. In everyday speech, many speakers prefer the -άω form, but both are perfectly normal.

So:

• Περπατάω σιγά σιγά...
• Περπατώ σιγά σιγά...

Both work.

Σιγά σιγά is a very common fixed expression. It means:

• slowly
• little by little
• sometimes gently or carefully, depending on context

So the repetition is not unusual or poetic here; it is just standard Greek.

In this sentence, Περπατάω σιγά σιγά means I’m walking slowly or I’m walking carefully/gingerly.

Yes. Γιατί can mean both:

• because
• why

In this sentence, it means because:

• Περπατάω σιγά σιγά γιατί πονάει το γόνατό μου.
• I’m walking slowly because my knee hurts.

When γιατί means why, it is usually clear from:

• sentence type
• intonation
• punctuation

For example:

• Γιατί περπατάς σιγά σιγά; = Why are you walking slowly?

So the same word does both jobs.

Πονάει is the 3rd person singular present of πονάω (to hurt / to be in pain).

It is 3rd person singular because the subject is:

• το γόνατό μου = my knee

So Greek is literally structured like:

• my knee hurts

That is why the verb is not πονάω (I hurt / I am in pain) but πονάει (it hurts).

You can think of it like this:

• Πονάω. = I’m in pain / I hurt.
• Πονάει το γόνατό μου. = My knee hurts.

In Greek, it is very common to use the definite article with possessive expressions:

• το σπίτι μου = my house
• ο φίλος μου = my friend
• το γόνατό μου = my knee

So Greek normally says the knee of mine, not just my knee the way English does.

This is especially normal with:

• body parts
• family relations
• everyday possessed nouns

So το γόνατό μου is exactly what you would expect in Greek.

This is about accent, not a change of meaning or case.

The basic word is:

• γόνατο = knee

When a word stressed on the third syllable from the end is followed by an enclitic like μου, Greek often adds an extra written accent:

• γόνατο
• γόνατό μου

So γόνατό μου is still just my knee. The noun has not changed into a different word; the accent is adjusted because of μου.

This happens with many other words too.

Μου here means my.

More literally, it is the weak possessive form related to me / my. In Greek, this possessive usually comes after the noun:

• το βιβλίο μου = my book
• το πόδι μου = my leg
• το γόνατό μου = my knee

So unlike English, Greek usually says:

• the knee my rather than
• my knee

Of course, the natural English translation is still my knee.

Yes, absolutely. Το γόνατό μου πονάει is very natural.

Greek word order is more flexible than English. Both of these work:

• ...γιατί πονάει το γόνατό μου
• ...γιατί το γόνατό μου πονάει

The difference is mostly about focus and rhythm, not basic meaning.

Very roughly:

• πονάει το γόνατό μου puts the verb first, then names what hurts
• το γόνατό μου πονάει puts more attention on my knee

Both are correct.

Because Greek is a language that often drops subject pronouns when they are not needed.

The ending of Περπατάω already tells you the subject is I. So εγώ is usually unnecessary.

You would add εγώ only for emphasis or contrast, for example:

• Εγώ περπατάω σιγά σιγά, όχι αυτός.
• I’m the one walking slowly, not him.

In a neutral sentence, leaving it out is more natural.

It can suggest both.

In this sentence, because the reason is my knee hurts, σιγά σιγά naturally sounds like:

• slowly
• carefully
• gingerly

So the idea is not just speed. It can also imply that the speaker is moving in a cautious way because of pain.

That is a very natural nuance in Greek here.