So "They are the cities" would not work? Well actually, it didn't work since it was marked wrong. It's a finely split hair in English.
I am also wondering this!
"They are the cities" is accepted and has always been.
Hmm, I could've sworn that's what I wrote that was rejected. If it happens again I'll report. Dekuji!
Why do you use "to" and not "ta"?
TO means THOSE here. In TA MĚSTA, TA means THE. I hope it's clearer now. :)
why can not use Ta instead of to?
and does it look like to a question? does not?
This is the extremely common "to je/je to" construction meaning "that is/this is".
What would be the difference between the given correct translation and "Those are the cities."?
To jsou ta města.