情况一
If someone did you a favor, and you want to express your thankfulness.
如果有人帮了你一个忙，你需要表达感激之情
1.I appreciate it.
我很感激。
2.I appreciate your efforts, thank you.
很感谢你尽力帮忙。
3.I couldn't have done that without you/your help.
要是没有你的帮助，我肯定做不来的。

情况二
团队完成一项工作，对大家说辛苦了
1.I appreciate everyone's hard work/efforts into finishing this project on time.
感谢每个人的辛苦工作，才能让这个项目按时完成！

情况三
节日时，感谢父母师长，对他们说辛苦了
1.I'm so grateful for you, mom!
我很感激你妈妈！
2.I'm so grateful that I can have you as a dad!
有你做我的爸爸我觉得好感激！
3.You're the best teacher ever!
你是最好的老师！
4.Thanks for taking care of me all these years!
感谢你这么多年对我的照顾！