Sympathy Expression

Sympathy expression is an expressions or feeling of pity and sorrow when we know and see someone or people are unlucky or have trouble and in bad condition.
How can we give sympathy expression to someone?
We express it directly to him/her orally or we can use a letter or card by post also by short message service (sms), e-mail, television, radio and newspaper if he/she who got the trouble is far from us.
Several expression of sympathy :
I’m sorry to hear that
Oh, dear
I know how it feels
Oh, you, poor little thing
I’m sorry for what’s happened
That’s a pity
Oh, no!
Look! This is not the end of the world
Don’t be sad