In act 1. What is the important of act 1 in the play?
The importance of Act I in George Bernard Shaw's play Pygmalion is that the dynamics that take place during this act serve as the backbone to the events that will eventually unravel in the play.
The first thing that we encounter is the Eynsford-Hill family coming out of Covent Garden and meeting Eliza for the first time. From the semi condescending behavior of the Eynsford women toward Eliza to the impression she left on their eldest male, Freddy, we can already perceive that the family and Eliza will meet again sometime in the future.
We also see the most important characters in that same act. The note-taker linguist in the background-who is actually Higgins, himself- will eventually become the pivotal character that will change Eliza's life forever. Additionally Col. Pickering and Higgins meet in that first Act, setting up the future for Eliza.