表达感激之情时，可以用以下几种方式来表达“appreciate”：
1. 口头表达：
"I really appreciate your help."
"Thank you so much for your support."
"I am grateful for your assistance."
"I truly value your friendship."
"Your kindness is very much appreciated."
2. 书面表达：
"I would like to express my sincere appreciation for your help."
"Your support has been invaluable to me."
"I am deeply grateful for your time and effort."
"Your help has made a significant difference, and I cannot thank you enough."
3. 非正式表达：
"Thanks for your help, I really appreciate it!"
"You're awesome for doing that for me!"
"I'm so glad you were there for me."
在表达感激之情时，根据具体情况和与对方的关系，可以选择合适的表达方式。
