Translation:Is tomorrow Sunday?
Hi! So for the specific case here (you're trying to find out if tomorrow is a Sunday) you're question is functionally the same, but the focus in the question is different. So you are basically asking an altered version of "When is Sunday?" but in this case tomorrow is the focus: "What day is it tomorrow? Is it a Sunday?" Basically, the difference is whether you're focusing on asking about "Sunday" or "tomorrow" - here, you should be asking about tomorrow. But colloquially you could totally get away with translating it as "Is Sunday tomorrow?"
Interesting! Any idea why the word for "Sunday" in Chinese didn't follow the same pattern as the rest of the days of the week, and become "week 7" instead?
In other words, what is the special significance of "Sunday" that it received this distinct word in Chinese separate from the other days of the week?
Do you think there are too many lessons on one theme? I feel there are. I personally can't exercise enough with the set of words just in one lesson they push all lessons in the row and only when I've got through all of them they allow me to repeat :( So for more vocabulary exercises I had to add memrise to my dayly routing and it helps. One nice person created a set of Duolingo cards there https://www.memrise.com/course/1748281/duolingo-chinese/ So I first go to Duolingo and do a lesson then work on new words in memrise and when I am ready I move on the next lesson in Duolingo.