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The -dik participle turns a verb into a modifier for a noun that is not its subject — the thing seen, the place lived in — and takes a possessive ending that marks who does the action.

What this participle does

Turkish has no separate word for "that" or "which". To describe a noun with a whole clause, it turns the verb into a participle and stands it in front of the noun. The -dik participle is the one used when the noun being described is anything other than the doer of the action — the object, the place, the time, or the thing the clause is about. gördüğüm means "the one I saw", and it sits straight in front of its noun.

What sets this participle apart is the ending it carries. Onto the participle goes a possessive suffix that agrees with the subject of the clause — the person doing the action. In gördüğüm that ending is the final part meaning "my", so the word says, quite literally, "the one of my seeing": the one I saw. The subject rides inside the word, and no separate pronoun is needed.

Four vowel shapes

The suffix comes in four vowel shapes, and four-way vowel harmony chooses between them: the vowel inside the suffix matches the last vowel of the stem in both dimensions — front or back, rounded or unrounded. A stem whose last vowel is a or ı takes -dık; one in e or i takes -dik; one in o or u takes -duk; one in ö or ü takes -dük.

The two right-hand columns show those same four shapes twice: once with a voiced first consonant, and once with the voiceless one that turns up after certain stems. The next section is about that split, and about a second change that happens once the possessive is added.

Consonant changes at the boundary

The suffix begins with a d after a vowel or a voiced consonant, and it hardens to a t after one of the voiceless consonants p ç t k f h s ş. The participle in yaptığın, "that you did", is built on a stem ending in a voiceless sound, so its suffix opens with t; the one in sevdiğim, "that I love", is built on a voiced stem and keeps the d.

The plain participle ends in k — the shapes listed in the table. Add a possessive that starts with a vowel and that k now stands between two vowels, where it softens to ğ. So the bare shape is -dük, yet the written word is gördüğü, with ğ: the possessive vowel ü has pulled the softening. This is why the forms you actually write show ğ where the table shows k.

The possessive marks the subject

The possessive on the participle tells you who the subject is. A first-person-singular ending means "my" and marks "I" as the subject: gördüğüm is "the one I saw", tanıdığım "the one I know". A second-person-singular ending, "your", marks "you": oturduğun "the one you live in", yaptığın "the one you did". A third-person-singular ending marks "he", "she" or "it": aldığı "the one he or she bought", gördüğü "the one he or she saw". A first-person-plural "our" marks "we": bahsettiğimiz "the one we spoke of".

Because the person is sealed inside the word, the participle can stand on its own: the ending already carries the subject, so a separate "I", "you" or "we" is normally left out. That single ending is what does the work an English relative pronoun plus a subject would do together.

Five worked forms

Here are five participles, each from a different verb and a different person. Read every one as a compact relative clause — a noun could follow any of them.

The ending is not optional

Take the possessive away and you no longer have a participle at all. The string gördüm film does not mean "the film I saw": the first word is simply the past tense "I saw", a finished sentence, and a finished sentence cannot stand in front of a noun to describe it. The relative reading needs the participle, gördüğüm film — "the film I saw" — where the ending carries the "I" that gördüm film leaves stranded.

When the described noun is the subject

This participle is only for relatives where the described noun is not the subject. When the noun is itself the doer, Turkish switches to a different participle. "The man who came" is gelen adam: the man is the one who came, so he is the subject, and the subject participle is used. Build that phrase with a -dik form instead and you get geldiği adam, which is wrong — the possessive on it announces that some other person is the subject, so it cannot mean "the man who came".

The rule of thumb is about who acts. If the described noun does the action, it takes the subject participle, as in gelen adam. If the noun is acted upon, or is the place, time or thing involved, it takes the -dik participle.

Objects, places, and topics

The noun a -dik participle describes can fill any role in the clause except the subject. It may be the direct object, a place, a time, or the thing the clause is about.

In a full phrase the participle comes first and the noun it describes follows it: gördüğüm film "the film I saw", oturduğun ev "the house you live in", bahsettiğimiz konu "the topic we spoke of".

The subject goes in the genitive

When the subject of the clause is spelled out, it stands in the genitive — the case of a possessor — because the participle behaves like a possessed noun. The pronouns are benim "my", senin "your", onun "his or her", and a named subject takes the same ending: Ali'nin "Ali's". The genitive subject and the possessive on the participle agree: onun aldığı "the one he bought", benim tanıdığım "the one I know".

In practice the pronoun is usually dropped. Since the possessive already fixes the person, benim tanıdığım and a bare tanıdığım both say "the one I know"; the pronoun is added only for emphasis or contrast. A named subject like Ali'nin stays, of course, since nothing else in the clause supplies the name.

The plural blocks the softening

Whether the k softens to ğ depends on the possessive that follows it. The third-person-singular possessive is a bare vowel, so it pulls the softening through: gördüğü "the one he saw", written with ğ. The third-person-plural possessive, though, begins with a consonant — it is the ending -leri — so there is no vowel at the seam, nothing triggers the change, and the k stays hard: gördükleri "the one they saw". Same verb, same participle, yet gördüğü softens and gördükleri does not.