Because Modern Hebrew has been learned by a significant amount of adult learners who speak languages from different families, it has undergone a great deal of simplification. Modern Hebrew reference grammars of the 1950s have a number of rules that are no longer observed.Sociolinguistically, too, Hebrew feels easier to learn because with a huge foreign-born population learning the language in adulthood, Israelis are perhaps more tolerant of mistakes than speakers of other languages.