Το κλουβί είναι δίπλα στο παράθυρο, γιατί εκεί το καναρίνι έχει περισσότερο φως.

Το is the definite article in the neuter singular, so το κλουβί means the cage.

The noun κλουβί is a neuter noun. Many Greek nouns ending in -ί are neuter, so they take το in the singular:

• το κλουβί = the cage
• το παιδί = the child
• το πουλί = the bird

Greek uses the definite article very often, sometimes more often than English does.

Δίπλα means next to or beside.

In Greek, δίπλα is usually followed by a phrase with σε or sometimes από:

• δίπλα στο παράθυρο = next to the window
• δίπλα στην πόρτα = next to the door
• δίπλα από το σπίτι = next to the house

So here:

• δίπλα = beside
• στο παράθυρο = to the window / at the window

Together, it naturally means next to the window.

Because στο is the normal contraction of σε + το.

So:

• σε το → στο
• σε την → στην
• σε τον → στον

That means:

• στο παράθυρο = σε το παράθυρο

This contraction is standard in modern Greek and is used all the time.

After σε, Greek normally uses the accusative.

So in this sentence, παράθυρο is in the accusative. However, with many neuter singular nouns, the nominative and accusative forms look the same, so you do not see a visible change:

• nominative: το παράθυρο
• accusative: το παράθυρο

So the case has changed functionally, but the form stays the same.

Here γιατί means because, and it introduces the reason for the first clause:

• Το κλουβί είναι δίπλα στο παράθυρο = The cage is next to the window
• γιατί εκεί το καναρίνι έχει περισσότερο φως = because there the canary has more light

In written Greek, it is very common to put a comma before a clause introduced by γιατί when it means because.

It can mean both:

• γιατί = because
• γιατί; = why?

You understand which meaning it has from the context.

Examples:

• Δεν έρχομαι, γιατί δουλεύω. = I’m not coming, because I’m working.
• Γιατί δεν έρχεσαι; = Why aren’t you coming?

In your sentence, it clearly means because.

Εκεί means there.

In this sentence, it points back to the place near the window:

• γιατί εκεί το καναρίνι έχει περισσότερο φως
• because there the canary has more light

It is not absolutely necessary for basic grammar, but it adds emphasis and clarity. It highlights that in that spot, by the window, the canary gets more light.

Without εκεί, the sentence would still work:

• Το κλουβί είναι δίπλα στο παράθυρο, γιατί το καναρίνι έχει περισσότερο φως.

But with εκεί, the location is more explicit.

Greek often uses the definite article with nouns when referring to a specific, known thing.

Here, το καναρίνι means the canary. It sounds natural because we are talking about a particular canary, presumably the one in the cage.

If you said just καναρίνι, it would sound less definite and less natural in this context.

In Greek, grammatical gender and natural sex are not always the same thing.

Καναρίνι is grammatically neuter, so it takes:

• το καναρίνι

That does not mean the bird is sexless. It only means the noun belongs to the neuter grammatical class.

This is very common in Greek. Many animal names are grammatically fixed:

• το καναρίνι = the canary
• το πουλί = the bird

If you want to specify biological sex, you usually do it in another way.

Περισσότερο φως means more light.

Here περισσότερο is the neuter singular form of περισσότερος, περισσότερη, περισσότερο, and it agrees with φως, which is neuter:

• περισσότερο φως = more light

Greek often uses περισσότερο with nouns to mean more.

You may also hear:

• πιο πολύ φως

That also means more light and is very common in everyday speech. So both are possible, but περισσότερο φως is perfectly correct and slightly more formal or careful in style.

Because φως here means light in general, not a specific light.

So:

• περισσότερο φως = more light

This is similar to English, where we usually say more light, not more the light.

Greek often leaves out the article with uncountable or general nouns in expressions like this.

They are both present-tense verb forms.

• είναι = is
  This comes from είμαι = I am
• έχει = has
  This comes from έχω = I have

So:

• Το κλουβί είναι δίπλα στο παράθυρο = The cage is next to the window
• το καναρίνι έχει περισσότερο φως = the canary has more light

Both are third person singular forms.

Greek word order is more flexible than English word order.

This sentence is very natural as written:

• Το κλουβί είναι δίπλα στο παράθυρο, γιατί εκεί το καναρίνι έχει περισσότερο φως.

But other orders are also possible, depending on emphasis. For example:

• Το κλουβί είναι δίπλα στο παράθυρο, γιατί το καναρίνι έχει εκεί περισσότερο φως.
• Δίπλα στο παράθυρο είναι το κλουβί, γιατί εκεί το καναρίνι έχει περισσότερο φως.

The written version puts the information in a very clear, neutral order:

1. where the cage is
2. why it is there

Because έχω in Greek is often used in a broad, natural way to express that something has, gets, or enjoys a certain amount of something.

So το καναρίνι έχει περισσότερο φως literally means the canary has more light, but in natural English we might also say:

• the canary gets more light
• the canary has access to more light

Greek often prefers simple verbs like έχω where English might choose a more specific wording.