How do preschool children develop syntax, morphology and phonology?

Question

"form"?

Answer 1

By listening to grownups speak their native language grammatically, clearly enunciating each sound.

Answer 2

Preschool children learn a ton of information from modeling what they see and hear in their environment.  The way parents and important adult figures in their life talk with them is super important.  Also, reading to your child daily increases their knowledge of language.