5 вопросов  к предложению на анг. я. : he became a pilot in 1991 (ПОмогите пж)

1.Did he become a pilot in 1991? 2.When did he become a pilot ? 3.Who he became a pilot in 1991? 4.Why did he become a pilot in 1991? 5.How did he become a pilot in 1991?