500
Briefly describe Brown's 5 stages
Stage 1 (~18 months): mostly single words, no grammatical morphemes except maybe towards end of stage 1 [about 24 months]. Stage 2 (~24 months): 2 to 3 word combos, early grammatical morphemes, basic word-order patterns, early use of basic kernel sentence, early merging of syntax, morphology and semantics. Stage 3 (~30 months): 3 words, 2 words with grammatical morphemes, different sentence types emerge. Stage 4 (~36 months) complex sentences, multiclausal, object complements, embedded wh- clauses. Stage 5 (~42 months): coordinated conjunctions for compound parts of speech or compound verbs