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2019 BCE
Language development at 2 years
understand "up," "down," "hot," "off"
use 10 to 20 intelligible words, mostly nouns
use complete words
put two short words together to form sentences
chatter and imitate, use some echolalia (repetitions of words and phrases)
have 20 to 25 percent of their speech understood by outsiders -
2019 BCE
At age four
understand most of what they hear
converse
have 900 to 1,000-word vocabularies, with verbs starting to predominate
usually, talk without repeating syllables or words
use pronouns correctly
use three to six-word sentences
ask questions
relate experiences and activities -
2019 BCE
at age 5
follow three consecutive commands
talk constantly
ask innumerable questions
use descriptive words and compound and complex sentences
know all the vowels and consonants
use generally correct grammar