Breakdown of Naquela aula, a professora explicou tudo devagar.
Questions & Answers about Naquela aula, a professora explicou tudo devagar.
Naquela is a contraction of em + aquela.
- em = in / on / at
- aquela = that (feminine singular)
So naquela aula literally means in that class/lesson.
This contraction is very common in Portuguese:
- em + o = no
- em + a = na
- em + os = nos
- em + as = nas
- em + aquele = naquele
- em + aquela = naquela
Because aula is feminine singular, aquela matches it.
Because the sentence needs the idea of in/during that class.
- aquela aula = that class / that lesson
- naquela aula = in that class / during that lesson
In this sentence, the phrase tells you when or in what context the explanation happened, so em is needed, and it contracts to naquela.