The use of augmentative and alternative communication systems based on graphic symbols requires children to learn to combine symbols to convey utterances. The current study investigated how children without disabilities aged 4 to 6 years (n = 74) performed on a simple sentence (subject-verb and subject-verb-object) transposition task (i.e., spoken model into graphic symbol sequence). Scores were obtained on initial testing, after training, and 1 month later. Error patterns were examined. Four-year-olds obtained significantly lower initial scores and were the only ones showing training effects and lower performance a month later. The distribution of error types was similar across age groups. These results suggest that the age of 4 may represent an important stage in the use of graphic symbol communication.