I wrote "η ώρα είναι έντεκα" and was marked wrong. Is order strict in this case?
I wouldn't say so. "Η ώρα είναι έντεκα" seems just fine to me. It's been added. ^.^
I wrote "ένδεκα" instead of "έντεκα". Is that wrong in this context?
No, it's fine. I've added it now; thanks!
"Είναι η ώρα έντεκα" wouldn't work?
It sounds a bit awkward, to my ears. A bit old fashioned too, maybe.
"η ώρα είναι τις έντεκα" - is it wrong to stick the second article in there?
Yes, I'm afraid so. ^.^The only case you could use the article, would be the one of στη/στις in order to say something like
When did you leave? - Πότε έφυγες;
I left at 2 o'clock. - Έφυγα στις 2. or
I left at 1 o'clock - Έφυγα στη 1.
Many thanks Dimitra. I've only just started on time in my classes (and there's not much of it in Duo), so my grasp is still a little shaky!
Oh, that's right ._. If you have any further questions about it, please let me know. ^.^