Relier Pairs Brown’s MLU stagesVersion en ligne Test yourself on Brown’s research on morphological acquisition by matching pairs of morphemes with the month age of mastery. par Som Person 1 Regular plural 2 Present progressive 3 Irregular past 4 Possessive ‘s’ 5 Regular third person 6 Regular past 27-33 26-48 26-40 25-46 28-50 19-28 1 Early III 2 Late II 3 Late I 4 Early I 5 Early II 6 Late III 31-32 12-22 27-28 28-30 22-26 33-34