Mā ticcuācān in etl = Let's eat the beans;
Mā niquitta in = May I see this, Let me see this;
Mā ontlami in tlaōlli = Let the corn be done with, Never mind if the corn runs out (lit., finishes)
Michel Launey, An Introduction to Classical Nahuatl, translated and adapted by Christopher MacKay (Cambridge: Cambridge University Press, 2011), 80.
aocmo nesia ma pã ma tortillas yn tianquisco ma tienda = no more did either wheat bread or tortillas appear
Here in This Year: Seventeenth-Century Nahuatl Annals of the Tlaxcala-Puebla Valley, ed. and transl. Camilla Townsend, with an essay by James Lockhart (Stanford: Stanford University Press, 2010), 122–123.
se probision rreal ynic aocmo calaquisque cabildo ma quixtiano ma mestiso ma molato ma tliltic ma chino sa mixcahuisque yn masehualtzitzintin = a royal decree that no Spaniard, mestizo, mulatto, black nor chino should enter the cabildo any more. The indigenous exclusively should do it.
Here in This Year: Seventeenth-Century Nahuatl Annals of the Tlaxcala-Puebla Valley, ed. and transl. Camilla Townsend, with an essay by James Lockhart (Stanford: Stanford University Press, 2010), 130–131.
The optative, ma, is a polite way of phrasing the imperative.
Also: ma ... ma = whether, or
Robert Haskett and Stephanie Wood's notes from Nahuatl sessions with James Lockhart and subsequent research.