Why does the Torah write "Yevi'ehah", and not "Yavi"?
Ramban: The Torah sometimes tends to first mention the object generally, and then to describe it in detail. 1
Ramban (according to Kabalah): See Ramban.
Why did Moshe see fit to repeat all the aspects of the Mishkan (albeit in general terms) to the people?
Ramban: Moshe already told them about the Mishkan in detail (in Terumah from Shemos 24:2) and in general terms (in Ki Sissa, from Shemos 31:7). Now that the time to donate had arrived, he gave them a broad picture of all that was required, to prompt them to donate generously. 1