Μπορώ να αλλάξω αυτό το πουκάμισο αν το μέγεθος δεν είναι σωστό;

In Greek, verbs like μπορώ (I can) are normally followed by να plus another verb.

So the pattern is:

• μπορώ να + verb

Here:

• μπορώ = I can
• να αλλάξω = to change / to exchange

So Μπορώ να αλλάξω...; means Can I exchange... ?

Without να, the sentence would sound ungrammatical.

Αλλάξω is the perfective non-past form, which is commonly used after να.

This is a very important Greek pattern:

• να αλλάζω = to be changing / to change in a general or repeated sense
• να αλλάξω = to change once, as a complete action

In this sentence, the speaker means a single completed action: exchange this shirt. That is why Greek uses να αλλάξω rather than να αλλάζω.

So although English just says change/exchange, Greek makes an aspect distinction here.

Αυτό means this, and το is the definite article the.

Greek often uses demonstrative + article + noun:

• αυτό το πουκάμισο = this shirt

The words must agree with the noun in gender, number, and case.

Since πουκάμισο is:

• neuter
• singular

you get:

• αυτό = this (neuter singular)
• το = the (neuter singular)

So αυτό το πουκάμισο literally looks like this the shirt, but that is the normal Greek way to say this shirt.

In Greek, every noun has a grammatical gender: masculine, feminine, or neuter.

Το πουκάμισο is a neuter noun. You can tell from the dictionary/article form:

• το πουκάμισο = the shirt

A very common clue is the ending -ο, which often marks neuter nouns, though not always. The safest way is to learn nouns together with their article:

• το πουκάμισο
• το μέγεθος

That way, you automatically know their gender.

Because μέγεθος is also a noun, and Greek usually uses the definite article where English often does too.

• το μέγεθος = the size

So:

• αν το μέγεθος δεν είναι σωστό = if the size is not right

Also, μέγεθος is neuter, so the article is το.

Greek articles are used very regularly, and learners often notice that Greek uses them a bit more consistently than English.

Because σωστό agrees with το μέγεθος.

• μέγεθος is neuter singular
• so the adjective must also be neuter singular

That gives:

• σωστός = masculine
• σωστή = feminine
• σωστό = neuter

So:

• το μέγεθος είναι σωστό = the size is right/correct

This agreement is a basic Greek rule: adjectives must match the noun they describe.

Αν means if.

So:

• αν το μέγεθος δεν είναι σωστό = if the size is not right

You may also see εάν, which is a fuller or slightly more formal version of αν. In everyday speech, αν is extremely common.

Δεν is the standard negative particle used before verbs in many Greek sentences.

So:

• είναι = is
• δεν είναι = is not

Greek negation usually works by putting δεν directly before the verb:

• δεν ξέρω = I do not know
• δεν θέλω = I do not want
• δεν είναι = it is not

That is exactly what happens here.

Greek often leaves out subject pronouns when they are not needed, because the verb ending already shows the person.

• μπορώ already means I can

So εγώ is unnecessary unless you want emphasis or contrast.

For example:

• Μπορώ να αλλάξω αυτό το πουκάμισο; = Can I exchange this shirt?
• Εγώ μπορώ να αλλάξω αυτό το πουκάμισο; = Can I exchange this shirt? / Am I allowed to exchange this shirt?

So the absence of εγώ is normal Greek.

It can mean either, depending on context.

In a shop context, with clothes, αλλάζω often means:

• exchange
• swap
• sometimes change/replace

So in this sentence, Can I exchange this shirt... ? is the natural meaning.

Greek often relies on context for this verb, just as English sometimes does with change.

Strictly speaking, αλλάξω suggests exchange/change, not necessarily return for a refund.

If someone specifically wants to ask about returning an item, Greek might use a different expression, for example with επιστρέφω in the appropriate context.

So this sentence most naturally means:

• Can I exchange this shirt if the size isn’t right?

not specifically:

• Can I return this shirt for my money back?

Yes, Greek word order is more flexible than English, though this sentence uses a very natural, neutral order.

Current order:

• Μπορώ να αλλάξω αυτό το πουκάμισο αν το μέγεθος δεν είναι σωστό;

This is straightforward and idiomatic.

Greek can sometimes move parts around for emphasis, but not every rearrangement sounds equally natural. For a learner, this version is a very good model to follow.

So the main idea is:

• Greek allows more flexibility than English
• but the given sentence is the standard, safe way to say it

Both main nouns here are in the accusative or nominative, depending on their role, but because they are neuter singular, the form looks the same.

1. αυτό το πουκάμισο

   • This is the direct object of αλλάξω
   • so it is in the accusative
   • but neuter singular accusative looks the same as nominative

2. το μέγεθος

   • This is the subject of είναι
   • so it is in the nominative
   • again, the neuter singular form looks the same

This is why learners do not see a visible change here, even though the grammatical roles are different.

A careful pronunciation would be roughly:

bo-RO na a-LAK-so af-TO to pu-KA-mi-so an to ME-ge-thos den EE-ne so-STO

A few useful notes:

• μπορώ has stress on the last syllable: -ρώ
• αλλάξω has stress on λά
• πουκάμισο has stress on κά
• σωστό has stress on the last syllable

Also:

• γ in μέγεθος is not like hard English g in go
• θ is like English th in think
• χ in αλλάξω is not an English k sound; it is a rougher sound, somewhat like the ch in German Bach or Scottish loch

Yes, that is possible.

• αν το μέγεθος δεν είναι σωστό
• αν δεν είναι σωστό το μέγεθος

Both can mean if the size isn’t right.

The difference is mostly one of emphasis and information flow. The version in your sentence is very neutral and probably the most natural one for a learner to use.

It is completely natural everyday Greek.

It sounds like something you could say in a clothing store:

• Μπορώ να αλλάξω αυτό το πουκάμισο αν το μέγεθος δεν είναι σωστό;

It is polite and normal without being overly formal. If you wanted to sound even more polite, you could add something like παρακαλώ, but the sentence itself is already appropriate.