The Definite Direct Object
In English, we use words like "the", "this", or "that" to show we are talking about a specific object. In Turkish, you mark a specific, definite direct object by adding the accusative case suffix to the noun.
Vowel Harmony and the Buffer 'y'
The accusative suffix follows four-way vowel harmony. Depending on the last vowel of the noun, you add -ı, -i, -u, or -ü.
If the noun ends in a vowel, you must insert the buffer letter y first (-yı, -yi, -yu, -yü).
- roman (novel) → romanı (the novel)
- adres (address) → adresi (the address)
- dergi (magazine) → dergiyi (the magazine)
- masa (table) → masayı (the table)
Definite vs. Indefinite
You only use this suffix for definite objects. If you are talking about an indefinite object (using bir for "a" or "an"), the noun does not take a suffix and remains in its plain dictionary form.
Common Verbs with Direct Objects
Many everyday verbs require a direct object, such as knowing, learning, forgetting, or losing something. When the thing you affect is specific ("this word", "the key"), you must use the accusative suffix.