Sympathy expressions

This is sympathy expressions.This is to comprehend and express the meaning nuance,and to respond and express the meaning nuance within formal/informal transactional.

Description about:an expression or feeling of pity and sorrow we know and see someone or people are unclucky or have troubleand in bad condition

Several expressions of sympathy
-I'm sorry to hear that
-oh how awful
-oh dear
-oh what a shame