Answer :
Jack takes up the name Ernest when he travels abroad
In the book," The importance of being earnest", Jack Worthing, the protagonist, is the guardian to Cecily Cardew, granddaughter of the late Thomas Cardew. He found and adopted Jack when he was a baby. In Hertfordshire, Jack is a major landowner and justice of the peace, with tenants, farmers, servants, and other employees.
He has also pretended to have an irresponsible black-sheep brother named Ernest who leads a scandalous life in pleasure and is always getting into trouble, it requires Jack to rush and clean up his messes. Jack goes by the name Ernest when in London, which is where he really goes on these occasions to pursue the very behavior he pretends to disapprove of in his imaginary brother. He owns the name Ernest until he finally wants to propose to a girl he loves, Gwendolen Fairfax, the cousin of his best friend, Algernon. Algernon starts to suspect him and confronts Jack and he eventually confesses. When Jack thinks of burying his imaginary brother, his best friend takes the name Ernest since Cecily has fallen in love with the imaginary brother and Algernon has fallen in love with Cecily.
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