"Do we hafta write the whole sentence?"
"Do we hafta show our work?"
"Why do I need to copy this?"
The questions your students ask are one of the best indicators that you have designed engaging learning. All teachers love it when their students are so engaged that they don't notice the clock on the wall or who comes in the door! Contrarily, it is not much fun hearing your students beg for ways to get out of the work you have asked them to do.