gratefulI'm grateful for your kindness.
appreciativeI'm really appreciative of all the help you've given me.
I/we appreciateI really appreciate all the help you've given me.
glad ofWe were very glad of some extra help.
indebted toI'm indebted to my parents for all their love and support.
thankfulI'm just thankful that she's safe and well.
relievedI'm relieved to hear that she's not as ill as we thought.