I studied
De todas as línguas que eu estudei, o francês foi a mais difícil.
Of all the languages I studied, French was the most difficult.
Eu estudei durante um ano em Boston.
I studied in Boston for a year.
I studied at this school.
Eu estudei inglês com um falante nativo por quatro anos.
I studied English with a native speaker for four years.
Foi em Pequim que eu estudei chinês.
It was in Beijing that I studied Chinese.
Yesterday, I studied all day.
I studied for three years.
I studied before dinner.