M. studies the acquisition of the point-sharing system (including the speaker's point-making, the hearer's point-using, devices for using point-sharing, and ways in wich these devices convey instructions). Twelve English grammatical devices are focused on: Definite article, indefinite article, pronominalization, ellipsis, relativization, stress, initialization, preverbal positioning, subject-verb agreement, verb selection, case marking, and particles.