1. Language ability development: evaluate the language ability development of preschool children, including listening, speaking, reading and writing. This includes vocabulary, grammar application, comprehension ability, expression ability and reading and writing level.

2. Communication and expression ability: evaluate preschool children's communication and expression ability, including oral expression ability, emotional expression, understanding and expression intention, nonverbal communication, etc. This involves preschool children's pronunciation, intonation, speech speed, language fluency, emotional expression and body language.