1.I have gained a lot of experience here.

　　我在这里积累了很多经验。

　　2.Thank you for your help, but I still want to leave the company.

　　谢谢您的关照，但我还是想离开公司。

　　3.I'd like to say that I’ve really enjoyed working for you.

　　我要说的是，我真的很高兴为您工作。

　　4.I'm sorry to leave here and I like the people I work with.

　　我很遗憾要离开这儿，我很喜欢这里的同事们。

　　5.I’ve learned a lot here.

　　我在这儿学到很多东西。

　　6.I appreciate the opportunity I've been given here.

　　感谢公司给予我的机会。