Didascalia/didascália/didascalie/didaskalia actually means stage direction (not sure about this term in English; I mean things like: "Exeunt ROSENCRANTZ and GUILDENSTERN, escorted by attendants; Enter POLONIUS" in a play) in Romance languages and also in Polish. Very interesting etymology again :)
"Hard" is one of the words accepted as you'll see from the drop down hints above. I cannot fanthom why yours wasn't. Please tell us if you had the sentence in the Tree, or a Test out , or Strengthen, section. It will help us find where the kink is. Thanks
its in the tree section. it didnt give any option on 'hard', just word difficult.
It's not accepting 'hard' for me, either, although it does give it as a mouse-over hint; I'm doing the lesson in the tree. (I also reported it.)
Teaching in general is difficult? Would "The teaching is difficult" be written the same way