Definite past -DI

The -DI past (also called the dili geçmiş zaman in Turkish grammar) is a simple past tense used to report events that the speaker directly witnessed, experienced, or is certain about. It is the default past tense for straightforward statements about completed actions — equivalent to the English simple past ("I went", "she saw", "we arrived"). The suffix takes one of eight phonological shapes — -di / -dı / -du / -dü or -ti / -tı / -tu / -tü — determined by vowel harmony and the final sound of the verb stem.

• Direct experience. Use -DI when you personally saw, heard, or did something. If you were there, -DI is the right choice.

• Completed actions. The action is finished and located in the past — often with time words such as dün (yesterday), geçen yıl (last year), sabah (this morning).

• Certain knowledge. Even if you were not physically present, use -DI when you have no doubt about the fact (e.g. a historical date you know to be true).

• Negation. Insert the negation suffix -me- / -ma- between the stem and -DI: git-me-di-m → "I didn't go".

• Yes/no questions. Add the question particle mi / mı / mu / mü after the full verb form (written separately): gittin mi? → "Did you go?"

The suffix is built in three layers: stem + -DI + personal ending. The suffix vowel follows four-way vowel harmony (i / ı / u / ü). The initial consonant of the suffix is d after voiced sounds and t after voiceless consonants (ç, f, h, k, p, s, ş, t). The personal endings belong to the group-1 (type-1) set, the same set used after the copula and some other suffixes.

For negation, add -me- (or -ma- after back-vowel stems) before the -DI suffix. The negation suffix is always voiced, so the -DI suffix remains -di / -dı / -du / -dü regardless of the original stem: git-me-di-m → gitmedim.

• Forgetting consonant assimilation. After a voiceless stem-final consonant the suffix must be -ti/-tı/-tu/-tü, not -di. Writing *gitdim is wrong; the correct form is gittim. Voiceless consonants that trigger this change: ç, f, h, k, p, s, ş, t.

• Confusing -DI with the -mIş evidential past. Use -DI when you witnessed or are certain about the event. Use -mIş when you are reporting something you heard second-hand or inferred. Saying geldi means "he came (I know this)"; gelmiş means "he apparently came (I was told / I inferred)".

• Using the wrong personal endings. The -DI past takes the group-1 endings (-m, -n, -k, -nIz), not the group-2 endings used in the present tense. A common mistake is *gittisin by analogy with geliyorsun. The correct 2nd singular form is gittin.

• Mixing up verbal -DI with the past copula -(y)DI. The suffix -DI also appears on nouns and adjectives as a past copula: hasta-ydı-m ("I was sick"), evde-ydik ("we were at home"). This is a different use of the same suffix — it is not a verb in those cases. Do not confuse geldim (verbal past: "I came") with hastaydım (past copula: "I was sick").