The phrase does not appear anywhere in Shaw's works. Sentences like "the rain in Spain," with repetitions of sounds for practice, are called "loaded sentences." They had been in use for teaching elocution for decades before Shaw wrote Pygmalion; though that does not mean that he didn't originate the phrase. To my knowledge, no one has yet documented the origin of "the rain in Spain," though one person has claimed it as her husband's invention.
Shaw did indeed write the phrase - it appears in the 1938 movie version starring Wendy Hiller and Leslie Howard, though not in his original stage play. Shaw won an Oscar for writing the screenplay for this filmed version. The film version was published by Penguin Books in 1941 and reprinted in from 1946 to 1965. Shaw also came up with the phrase "In Hampshire, Hereford and Hertford hurricanes hardly ever happen" although it is slightly changed to "In Hertford, Hereford and Hampshire..." in the musical version, My Fair Lady. Grand old man!
No, George Bernard Shaw did not originate the phrase "The rain in Spain stays mainly in the plain." It was actually written by Alan Jay Lerner as part of the lyrics of the song "The Rain in Spain" from the musical "My Fair Lady."
George Bernard Shaw did not write the phrase "Youth is wasted on the young." It's commonly misattributed to him but was actually coined by the American author and poet George Meredith in his 1862 work "Modern Love."
{| |- | US presidential advisor Bernard Baruch used the phrase. He was giving a speech in South Carolina. It was in 1947 and is credited with being the origins of the phrase, though George Orwell had used it earlier. |}
latin
The Bible
from joey in friends
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1820-30
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in concord and lexington.
from girls ...to hissy...
England
Andy Maio invent this phrase in the early 70s