During Stage 4, sentence forms expand with the development of wh questions. The concept of actions that happened in the past is developing, and the person learns to say common past tense verbs that do not end in –ed, such as saw, said, told, and went. Use of possessive endings will emerge. Additional skills that develop during Stage 4 can be found in the Reference Charts located at http://www.aaclanguagelab.com/other/charts.
|Approx. Vocab. Size||Utterance Length in Morphemes*||Examples|
|1,000 to 2,000 words||Range: 3.0 to 3.75 Mean: 3.5||I saw bird., Daddy’s car, I fell down., It is hot., Where is it?, Don’t want.|
*a morpheme is the smallest unit of meaning in a language