Son repliğini yine unuttun.

Here son means last or final.

So son replik = the last line / final line.

A useful point: in Turkish, words like son, ilk, büyük, güzel act like adjectives before the noun, and they do not change form.

Replik usually means an actor’s line or a piece of dialogue, especially in theater, film, or TV.

So in this sentence, it is not a general word for any sentence. It specifically suggests something like a scripted line.

Because the noun has suffixes attached to it.

The form can be broken down like this:

• replik = line
• then extra endings are added for possession and object marking

Also, the final k changes to ğ before a vowel-initial suffix:

• replik → repliğ-...

This is a common Turkish sound change called consonant softening.

In the intended reading, it is:

• replik
• -in = your
• -i = accusative/direct-object marker

So:

• replik + in + i → repliğini

That gives the sense of your line as a specific object.

Not always. This form is actually ambiguous by itself.

It can mean either:

• your line
  (replik-in-i)

or

• his/her/its line
  (replik-i-ni)

Context tells you which one is meant. If the shown meaning is your last line, then that is the reading you should take here.

Because unutmak is a transitive verb: you forget something.

In Turkish, when the direct object is specific/definite, it usually takes the accusative ending.

Compare:

• Bir replik unuttun. = You forgot a line.
• Repliğini unuttun. = You forgot your/the specific line.

Since this is a particular line, Turkish marks it as a definite object.

Because Turkish adjectives normally do not agree with the noun.

The noun takes the important endings:

• possession
• case
• plural

But the adjective usually stays unchanged.

So Turkish says:

• son repliğini

not something like an inflected version of son.

Unuttun comes from:

• unut- = forget
• -tu = past tense
• -n = you (singular)

So:

• unut- + tu + n → unuttun

The double tt happens because the verb stem already ends in t, and the past tense suffix here also begins with t.

So unuttun means you forgot.

Because Turkish often leaves out subject pronouns when the verb already shows the subject.

Here, -n in unuttun tells you the subject is you (singular).

So sen is unnecessary unless you want emphasis:

• Sen son repliğini yine unuttun. = You forgot your last line again.

That can sound more emphatic or contrastive.

Yine means again.

In this sentence, it comes just before the verb:

• Son repliğini yine unuttun.

That is very natural Turkish.

You can also move it for different emphasis, for example:

• Yine son repliğini unuttun.

Both are possible, but the focus can shift slightly.

Not completely.

A neutral Turkish statement often puts the verb at the end, which this sentence does:

• Son repliğini yine unuttun.

But Turkish word order is fairly flexible, especially for emphasis or style.

Possible variations include:

• Yine son repliğini unuttun.
• Son repliğini unuttun yine.

These can sound a little different in emphasis, but the basic meaning stays close.

Because Turkish does not have a separate word exactly like English the.

Definiteness is often shown through:

• context
• possession
• the accusative ending

So repliğini already carries the idea of a specific, known line. That is why Turkish does not need an extra word for the here.

In modern Turkish, ğ usually is not pronounced like a strong English g.

In a word like repliğini, it mostly creates a smooth transition or slight lengthening between vowels.

So you should not pronounce it like a hard g in go.

A rough pronunciation is something like:

• reh-plee-ee-nee

That is only approximate, but the key idea is: ğ is soft, not a strong consonant.