Answer :

Jake changes his speech when he talks to his 2-year-old sister, as compared to when he talks to his kindergarten teacher. this is an example of development in pragmatics

This is further explained below.

What is pragmatics?

Generally, pragmatics, The research of how human language is used in conversation; more broadly, the study of the relationships among languages and their users.

This field of research may be found in both linguistics and philosophy.

In conclusion,  When talking to his younger sister, who is just two years old, Jake uses a different tone of voice than when he is speaking to his kindergarten instructor.

This demonstrates a progression in pragmatics, for example.

Read more about pragmatics

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