did the main actor of this movie do any theater drama before entering movies?
Yes
Humphrey Bogart
Bogart signed a contract with the Fox Film Corporation for $750 a week. There he met Spencer Tracy, a Broadway actor whom Bogart liked and admired, and they became close friends and drinking companions. In 1930, Tracy first called him "Bogie". 
who played the female lead in the 1942 film casablanca Ingrid Bergman who was the male lead? Humphrey Bogart has it been dubbed in any other languages? UNANSWERABLE has the actress done any movies in languages other than english? Yes, italian films can you name a few? "Stromboli" what was this movie about? Karin, marries an Italian ex-POW fisherman who is very harsh and barren.Karin becomes increasingly despondent and eventually decides to escape the volcano island. is there a geographical place with the same name? Yes, it  is a small island. where is it found? Tyrrhenian Sea, off the north coast of Sicily are there any significant geographical features along the coast of this sea? Sciara del Fuoco what is it? A big horseshoe-shaped depression. where was the previously mentioned movie filmed? UNANSWERABLE
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Humphrey Bogart [SEP] Broadway to Hollywood
Bogart signed a contract with the Fox Film Corporation for $750 a week. There he met Spencer Tracy, a Broadway actor whom Bogart liked and admired, and they became close friends and drinking companions. In 1930, Tracy first called him "Bogie". He made his film debut in his only film with Bogart, John Ford's early sound film "Up the River" (1930), in which they had major roles as inmates. Tracy received top billing, but Bogart appeared on the film's posters. He was billed fourth behind Tracy, Claire Luce and Warren Hymer. Bogart then had a supporting role in "Bad Sister" (1931) with Bette Davis.