Explanation: English for Specific Purposes usually focuses on teaching people who are at a university level or who have a job, in order to obtain an English learning applied to their area. Depending on the profession or interest, English teaching will focus specifically on working in one of these areas. This type of teaching is very beneficial for their learning since they will learn based on their goals.
The inference that can be drawn from these lines of Feste's song in Shakespeare's Twelfth Night is that they are making reference to life's unpredictability and; therefore, they urge people to enjoy their youth.
