4Grammar and explanations
No word for "didn't"
English puts "didn't" in front of the verb. Mongolian changes the ending of the verb itself. To deny something in the past, drop –сан and put –аа in its place, followed by –гүй, the negative you know from –хгүй and байхгүй.
| Stem | Past | Negative past |
|---|
| ав– (take, buy) | авсан | аваагүй |
| оч– (go to) | очсон | очоогүй |
| ир– (come) | ирсэн | ирээгүй |
| өг– (give) | өгсөн | өгөөгүй |
The first part, –аа / –оо / –ээ / –өө, follows vowel harmony like –сан. The second part, –гүй, never changes: it keeps its ү even after back vowels, so there is no –гуй.
Би талх аваагүй.I bread take-PART-NEG"I didn't buy bread."
Өнөөдөр талх ирээгүй.today bread come-PART-NEG"No bread came in today."
Тэмүүлэн хоол идээгүй.Temuulen food eat-PART-NEG"Temuulen hasn't eaten."
Би Говьд очоогүй.I Gobi-DAT go-PART-NEG"I haven't been to the Gobi."
Stems ending in a long vowel or й
These stems insert г before the ending.
| Stem | Negative past |
|---|
| хаа– (close) | хаагаагүй |
| уу– (drink) | уугаагүй |
| хий– (do) | хийгээгүй |
| бай– (be) | байгаагүй |
Би тэнд байгаагүй.I there be-PART-NEG"I wasn't there."
"Not yet"
The same form also means "has not … (yet)": Дэлгүүр хаагаагүй. "The shop hasn't closed (yet)." The context tells you whether English needs "yet".
Short answers
Answer a question in the past by repeating the verb, positive or negative.
Талх авсан уу? — Аваагүй."Did you buy bread? — No, I didn't."
Another negative you will hear
Mongolians also say –сангүй, keeping –сан and adding –гүй: харсангүй "didn't see", ирсэнгүй "didn't come". It often carries a touch of disappointment, as in "it just didn't come". Recognise it, and use –аагүй yourself.
Go deeper in the grammar guide: Negation in Mongolian · The four Mongolian pasts