I'm 'grateful' (to you) for this opportunity. = I'm 'grateful' to have this opportunity. = I'm 'grateful' that I have this opportunity.
expressing my 'gratefulness' [=(more commonly) 'gratitude'] for this opportunity
The college 'gratefully' [='thankfully'] acknowledges your donation.
(..) It grieves us deeply. We pray that you will return to your wedded husband and behave as a Christian wife ought to behave. I am grateful for your concern, Mother. But there is no need to pray for me. If we do not pray for your soul, daughter, (..)2017 TvShow: Vikings Title: The Great Army Season: 4 Episode 17