Kamera gözetimi silindir kilidi de gösteriyor.

Because both are part of Turkish noun compounds.

• kamera gözetimi = camera surveillance / surveillance by camera
• silindir kilidi = cylinder lock

In this very common Turkish pattern, the second noun usually takes the 3rd person possessive ending -(s)ı / -(s)i / -(s)u / -(s)ü.

So:

• gözetim → gözetimi
• kilit → kilidi

This does not automatically mean possession in the English sense. It is just the normal way Turkish builds compounds like:

• araba kapısı = car door
• ev anahtarı = house key
• kamera gözetimi = camera surveillance

This is because of a common sound change in Turkish called consonant mutation.

Some words ending in p, ç, t, k change when a vowel-initial suffix is added. In many cases:

• p → b
• ç → c
• t → d
• k → ğ/g

So:

• kilit
  • -i → kilidi

This is very normal in Turkish. Similar examples:

• kanat → kanadı
• ağaç → ağacı
• kitap → kitabı

Not by itself. In silindir kilidi, the -i is part of the noun compound, not the accusative.

Base compound:

• silindir kilidi = cylinder lock

If this phrase were marked as a definite/specific direct object, it would normally take an additional accusative ending:

• silindir kilidini

So the difference is:

• silindir kilidi = cylinder lock
• silindir kilidini = the cylinder lock (as a definite/specific object)

That is an important distinction for learners, because the compound ending and the accusative can look similar.

de here means also / too / as well.

It is written separately because this de is a particle, not a normal suffix.

So:

• silindir kilidi de = the cylinder lock too / also a cylinder lock

Be careful not to confuse this with the locative suffix -de / -da, which is written attached:

• evde = in the house
• kamerada = on the camera / in the camera

But:

• ev de = the house too
• kamera da = the camera too

Because de usually follows the word or phrase it is focusing on.

Here:

• silindir kilidi de means the thing being added is the cylinder lock

So the sentence highlights that the cylinder lock also is shown.

If you move de, the focus changes:

• Kamera gözetimi de silindir kilidi gösteriyor.
  = Camera surveillance also shows the cylinder lock.
  (Now camera surveillance is the thing being added.)

• Kamera gözetimi silindir kilidi de gösteriyor.
  = It also shows the cylinder lock.
  (Now the cylinder lock is the added element.)

Because Turkish normally prefers verb-final word order.

A very common basic order is:

• Subject + Object + Verb

Here that is roughly:

• Kamera gözetimi = subject
• silindir kilidi de = object
• gösteriyor = verb

So the sentence follows a very normal Turkish pattern.

Turkish word order is flexible, but the verb often stays near the end, especially in neutral statements.

gösteriyor comes from the verb göstermek, meaning to show.

Breakdown:

• göster- = verb stem
• -iyor = present continuous / ongoing present
• third person singular has no extra ending here

So gösteriyor means:

• is showing
• or sometimes simply shows, depending on context

This is very common in Turkish: the -iyor form can express something happening now, or a present situation more generally.

Turkish does not use articles the way English does.

There is no direct equivalent of the in most sentences, and a/an is often expressed with bir only when needed.

So Turkish often leaves article-like meanings to context.

For example:

• silindir kilidi can mean a cylinder lock or the cylinder lock, depending on context
• if Turkish wants to make the object clearly specific, it often uses the accusative
• if it wants to say a/one, it may use bir

That is why learners often need to rely on the larger context, not just one word.

Because these are two different structures in Turkish.

1. kamera gözetimi
   This is a noun compound. It means something like camera surveillance or surveillance by camera.

2. kameranın gözetimi
   This is a genitive-possessive structure. It more literally means the surveillance of the camera or the camera’s surveillance, depending on context.

So:

• kamera gözetimi sounds like a fixed type/category
• kameranın gözetimi sounds more explicitly possessive or relational

In this sentence, kamera gözetimi is the more natural way to express the idea as a compound noun.

A good first guess is to use word order and sentence logic.

Here:

• Kamera gözetimi comes first and works naturally as the subject
• silindir kilidi de comes before the verb and works as the object
• gösteriyor is the verb

So the structure is:

• [Subject] Kamera gözetimi
• [Object] silindir kilidi de
• [Verb] gösteriyor

In Turkish, this is very normal.

Also, semantically, camera surveillance is something that can show something, while cylinder lock is something being shown. That helps confirm the roles.