Gratitude, Compliment and Congratulation

 Gratitude
Gratitude is an expression that we show or say to express grateful feeling to other people, when speaking English, you say “thanks” very often please say “thank you” when people give you something and give you compliment, etc.

Expressing Gratitude:
I shold like to express my gratitude
Thank you very much
Thanks for your help
How can I thank you?
I`m very grateful to you
I can`t thank you enough

Responding:
It was the least I could do
You`re welcome
No big deal
Don`t metion it
It`s a pleasure
That`s all right

 Compliment
Compliment is expression that used to give praising to other people.
Some people use compliment to butter up somebody or to flatter in order to increase good will.

Complimenting:
Good grades!
Nice work!
Excellent!
Good job!
You look great!
You look very nice/beautiful/handsome

 Congratulation
Congratulation is expression that used to said congratulate to someone when get a success.

Congratulating:
I must congratulate you
Please accept my congratulations
I`d like to be first to congratulate you
Congratulations on your success
Let me congratulate you