- «Час» is used with numerals ending in 1 (but not 11).
- «Часа́» is used with the numerals ending in 2, 3, 4 (but not in 12, 13, 14).
- «Часо́в» is used with all the other numerals.
If only the app allowed people to comment on each exercise in order to get an answer.
Thanks! It's really difficult to grasp all these rules, your help is very much appreciated.
o'clock is one word. It is not written as o' clock with a space like that.
I had the same on a word selection exercise where i was forced to select o' and clock as separate words.
Duo seems to have an issue with the word order, I've flagged it.
Yes, it fails on "It is now two o'clock" too. Flagged to allow the word order since it's pretty common.
Could два часа mean both two o'clock and two hours? How to distinguish the two meanings in Russian?
I hopefully don't sound rude but could you provide examples in English and we can post translations ? That might be easier.
I guess that "two hours" would take the nominative plural ending ы́,
rather than the genitive singular ending ча́са/ часа́ in "two o´clock".
(Note that I don´t know; it´s only a guess.)
@Shivaadh - "Two hours" will still be два часа. The numbers 2, 3 and 4 use genitive singular, and 5 and above uses genitive plural. The numbers themselves and the words they modify can also adapt to other cases (for instance, "к двум часам мы завершим работу" (we will have completed the work by two o'clock).
We don't know if it is 2 PM (1400) in this sentence or not, it could very well be 2 AM.