Khmer is the main and official language of Cambodia.
Knowing a few Khmer words will help you earn some respect while in Cambodia.
Although Khmer uses base-10 numbers, the numbers for 1-9 are effectively spoken as base-5. Thus, six (bpram mouy) literally means five (bpram), one (mouy); whereas sixteen (dop bpram mouy) is ten (dop), five (bprum), one (mouy).
In practice, the word 'sep' is often omitted from the numbers for 30-90. However, it is generally considered more proper to include the word.
Bus and train
p'theh k'ngom- my house
dtoh p'theh k'ngom- go to my house
ne ke ghtu
baawwk (to drive) laan (car)