4Grammar and explanations
By what? The instrumental
To say how you travel, Mongolian puts an ending on the vehicle itself, where English uses "by": –аар / –оор / –ээр / –өөр. This case is called the instrumental: it marks the tool or the means you use.
Би онгоцоор ирсэн.I plane-INS come-PAST"I came by plane."
Бид машинаар явж байна.we car-INS go-CONV be-PRES-FUT"We are travelling by car."
Номин галт тэргээр явсан.Nomin train-INS go-PAST"Nomin went by train."
Би хотод автобусаар явдаг.I city-DAT bus-INS go-HAB"In town I get around by bus."
The forms
The vowel of the stem comes back doubled before р: а gives –аар, о gives –оор, э gives –ээр, ө gives –өөр (мөнгөөр "with money"). Words whose vowel is у or ү have no doubled form of their own and borrow –аар and –ээр: автобусаар, хүнээр.
| Word | Instrumental | Note |
|---|
| автобус | автобусаар | у borrows the а form |
| машин | машинаар | и is neutral; а decides |
| онгоц | онгоцоор | |
| галт тэрэг | галт тэргээр | only the last word changes, and its short э drops |
| такси | таксигаар | a linking г after the final vowel |
| унадаг дугуй | унадаг дугуйгаар | a linking г after й |
| морь | мориор | ь becomes и |
Asking "by what?"
юу + the instrumental gives юугаар "by what, how": Та юугаар ирсэн бэ? "How did you get here?" The answer replaces юугаар with the vehicle: Онгоцоор. "By plane."
Only the last word
In a group of words that names one thing, only the last word takes the ending: галт тэргээр, унадаг дугуйгаар. Look at the last word, never the first, to choose the vowel.
The same ending for a language
You may already know монголоор ярих "to speak Mongolian". A language is treated as the tool you speak with, so it takes the instrumental too: англи хэлээр "in English".
Go deeper in the grammar guide: The instrumental case · Choosing case endings
5Good to know
There is no railway to Arkhangai. Mongolia's main railway line crosses the country from north to south, linking Russia, Ulaanbaatar and China, so most provinces are reached by road. Long-distance buses leave Ulaanbaatar every day for the province centres, and the last kilometres to a herder's camp are often done by car, motorbike or horse.