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Brown's stage 1 I
12-26 months
About 50 words in vocabulary
Basic phrases (with communicative intent)
"more juice" "my doll"
Brown's stage 2 II
27-30 months
Present progressive -ing "man running"
"in" and "on" "in house" "on book"
Regular plural -s "my kids"
Brown's stage 3 III
Irregular past tense "me drew"
Possessive 's "daddy's hat"
Uncontractible copula "he is sick"
Brown's stage 4 IV
35-40 months
Articles (a, the) "the bucket"; "a drink"
Regular past tense "she shopped"
Third person regular present tense "he runs"
Browns stage 5 V
Third person irregular "doggy does tricks"
Uncontractible auxiliary "He was jumping"
Contractible copula "She's happy"
Contractible auxiliary "She's dancing"
Copula
A connecting word, particulary the verb BE connecting a subject and a complement
Describe internal state or identity
Acts as an equal sign Bob is happy -> Bob = happy
Compliment of this is mostly a noun or adjective
auxillary
helping verbs (do, be, have) support a main verb
Auxillary shows tense, aspect, or mood
Bob HAS gone or Bob IS running
Compliment of this is always a verb
Mean length of utterance (MLU) formula
Total number of MORPHEMES/Total number of UTTERANCES
12-26 months MLU (1:0-2:2)
1.0-2.0
27-30 months MLU (2:3-2:5)
2.0-2.5
31-34 months MLU (2:6-2:10)
2.5-3.0
35-40 months MLU (2:11-3:4)
3.0-3.75
41-46 months MLU (3:5-3:10)
3.75-4.5
47+ months MLU (3:8+)
4.5+