Overgeneralization of grammatical rules
- My teacher holded the baby rabbits and we patted them.
- Hey, Horton heared a Who.
- I Finded Renee.
- I love cut-upped egg.
- Once upon a time a alligator was eating a dinosaur and the dinosaur was eating the alliagtor and the alligator goed kerplunk.
Underextensions
3 years to 4 years old
- Fully acquired adult-like syntax
- Correct in quantity and quality of speech patterns about 90% of the time