Η πινακίδα κυκλοφορίας είναι καθαρή, αλλά το κιβώτιο ταχυτήτων έχει ελάττωμα.

These are different forms of the Greek definite article the, and they change according to grammatical gender.

• η = feminine singular nominative
• το = neuter singular nominative

So:

• η πινακίδα = the license plate because πινακίδα is feminine
• το κιβώτιο = the gearbox / transmission because κιβώτιο is neuter

Greek articles must agree with the noun in gender, number, and case.

Because adjectives in Greek must agree with the noun they describe.

Here, καθαρή describes πινακίδα, which is:

• feminine
• singular
• nominative

So the adjective also has to be feminine singular nominative:

• masculine: καθαρός
• feminine: καθαρή
• neuter: καθαρό

Since πινακίδα is feminine, καθαρή is the correct form.

It is a noun phrase made of:

• πινακίδα = plate / sign
• κυκλοφορίας = of circulation / traffic / registration

Together, πινακίδα κυκλοφορίας is the normal Greek way to say license plate or registration plate.

Grammatically, κυκλοφορίας is in the genitive singular, so the phrase literally means something like:

plate of circulation/registration

This is a very common Greek pattern: one noun followed by another noun in the genitive to show a relationship.

Because it is the genitive singular form of κυκλοφορία.

• nominative: η κυκλοφορία
• genitive: της κυκλοφορίας

In the phrase πινακίδα κυκλοφορίας, the second noun functions like of registration or of circulation, so Greek uses the genitive.

A native English speaker may think of it as similar to:

• car door = door of the car
• license plate = plate of registration

Greek often expresses this kind of idea with the genitive.

Literally, it means box of gears/speeds.

• κιβώτιο = box
• ταχυτήτων = of speeds / gears

In actual usage, this phrase means gearbox or transmission.

So even though the literal wording may sound strange in English, it is the standard Greek term.

Because it comes from ταχύτητα, which here refers to a gear or speed setting, and a gearbox has multiple gears.

So:

• ταχύτητα = speed / gear
• ταχυτήτων = of gears / of speeds

The phrase κιβώτιο ταχυτήτων therefore literally means box of gears.

This is another genitive construction, but this time with a plural noun.

Because the two parts express different kinds of ideas.

• είναι καθαρή = is clean
  This links the subject to an adjective.
• έχει ελάττωμα = has a defect
  This shows possession or the existence of a problem.

So:

• Η πινακίδα κυκλοφορίας είναι καθαρή = the plate is clean
• το κιβώτιο ταχυτήτων έχει ελάττωμα = the gearbox has a defect

This is very natural Greek, just as it is in English.

Greek does not have an indefinite article used as regularly as English a/an.

So English says:

• has a defect

But Greek simply says:

• έχει ελάττωμα

That is completely normal. The noun is understood as indefinite from the context.

You could think of it as:

• has defect literally
• but naturally: has a defect

It is the direct object of έχει, so it is in the accusative.

However, with many neuter nouns, the nominative and accusative forms are the same, so you do not see a change here.

For ελάττωμα:

• nominative singular: το ελάττωμα
• accusative singular: το ελάττωμα

So it looks the same, even though its function in the sentence is as the object of has.

Because αλλά means but, and it connects two contrasting clauses:

• Η πινακίδα κυκλοφορίας είναι καθαρή
• το κιβώτιο ταχυτήτων έχει ελάττωμα

The comma helps separate the two ideas, just like in English:

The license plate is clean, but the gearbox has a defect.

In standard written Greek, using a comma before αλλά in a sentence like this is normal.

Yes, Greek word order is more flexible than English, although the given version is the most neutral and natural.

For example, Greek could move words around for emphasis, such as:

• Καθαρή είναι η πινακίδα κυκλοφορίας, αλλά το κιβώτιο ταχυτήτων έχει ελάττωμα.

This would sound more marked, with emphasis on clean.

But for a learner, the safest choice is the original straightforward order:

• subject + verb + complement
• subject + verb + object

A simple pronunciation guide is:

i pinakÍða kikloforÍas Íne katharÍ, allá to kivÓtio tachitÍton Échi elÁtoma

A few helpful notes:

• η / ι / υ / ει / οι are all pronounced like ee in modern Greek
• δ sounds like th in this
• θ sounds like th in think
• χ is a rough sound, like the ch in German Bach or Scottish loch
• Greek stress matters, and the written accent mark shows where the stress falls:
  • πινακίδα
  • κυκλοφορίας
  • είναι
  • καθαρή
  • αλλά
  • κιβώτιο
  • ταχυτήτων
  • έχει
  • ελάττωμα

No. By itself, πινακίδα is a more general word meaning sign, plate, board, or notice, depending on context.

For example, it can refer to:

• a road sign
• a shop sign
• a metal plate
• a number plate

It means license plate here only because of the full phrase πινακίδα κυκλοφορίας.

Not exactly. Ελάττωμα usually means a defect, fault, or flaw rather than a general problem.

So in this sentence it suggests that the gearbox has some kind of fault or defect.

If Greek wanted to say a more general problem, another common word would be πρόβλημα.

So:

• έχει ελάττωμα = it has a defect / fault
• έχει πρόβλημα = it has a problem

The first is a bit more specific.