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Brown's 14 Grammatical Morphemes (Age of Mastery)

STUDY
PLAY
Present Progressive (-ing)
19-28
In
27-30
On
27-30
Regular Plural (-s)
24-33
Irregular Past
25-46
Possessive ('s)
26-40
Uncontractible Copula
27-39
Articles
28-46
Regular Past (-ed)
26-48
Regular Third Person (-s)
26-46
Irregular Third Person
28-50
Uncontractible Auxiliary
29-49
Contractible Copula
29-49
Contractible Auxiliary
30-50