Tense marking in Black English: A linguistic and social analysis. Fasold, R. W. Center for Applied Linguistics, Arlington, VA, 1972.
bibtex   
@book{fasold_tense_1972,
	address = {Arlington, VA},
	series = {Urban language series},
	title = {Tense marking in {Black} {English}: {A} linguistic and social analysis},
	isbn = {978-0-87281-031-0},
	number = {8},
	publisher = {Center for Applied Linguistics},
	author = {Fasold, Ralph W.},
	year = {1972},
	keywords = {Habitual be, Invariant be},
}

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