고마움

1. How can I ever thank you?/I can't thwnk you enough./ Thank you. I appreciate it.

2. Many thanks./ Thank you for your kind words.

3. You shouldn't have gone to the trouble.그러실 필요까지 없었는데.

4. I don't know what I would've done without you./ I  couldn't have done this without you.

5. To say "Thank you" is such an understatement to express my gratitude.