When he rides the school bus, tommy engages in casual conversation with his friends. he uses more formal language when he gives oral reports in the classroom. tommy's ability to use appropriate language in each situation shows his understanding of the?

It shows his understanding of "pragmatic system".

Pragmatics is part of linguistics that deal with the social parts of dialect; (alternating in a discussion, content association, pre-supposition and inferred meaning). It might be said, pragmatics is viewed as a comprehension between individuals to comply with specific standards of connection. In ordinary dialect, the implications of words and expressions are always suggested and not unequivocally expressed. In specific circumstances, words can have a specific significance.

A)A formal discussion follows certain rules.

i dont believe in religion. lets all be peace