Just a quick question. Is qu’est-ce que + noun always more formal? I found it a bit confusing that
a. the last two examples of it in Section 3 have no further mention of register and
b. in Sections 1 and 3 the examples go from less to more elegant, whereas in 2 it’s the other way round.
Do realise this is an A0 lesson, but the concepts behind it are quite challenging.