in prep
1 (indicating place, position)
em
2 (with place names, of town, country, region)
em
3 (indicating time, during)
em
4 (indicating time, in the space of)
em
5 (indicating manner etc)
in a loud/soft voice em voz alta/numa voz sauve
6 (indicating circumstances)
in the sun ao or sob o sol
7 (indicating mood, state)
in tears aos prantos
8 (with ratios, numbers)
1 in 10 1 em 10
9 (referring to people, works)
em
10 (indicating profession etc)
to be in teaching/publishing ser professor/trabalhar numa editora
11 (after superl)
the best pupil in the class o melhor aluno da classe
12 (with present participle)
in saying this ao dizer isto adv