thanks a lot/thanks a bunch/i appreciate it/it means a lot to me/i don't know what to say/that was kind of you/thank you so much/thank you very much.
非常谢谢用英语可以这么说：
1. thanks
后面加上不同的词，就成了thank you so much. / thank you very much. / thanks a lot./ thanks a bunch。
2. i can't thank you enough.
can't do sth enough就是再怎么都不为过，这句话就是无法形容对你有多感谢，感激不尽。
3. cheers
cheers在英国和澳洲更通用哦。
"i've bought you a drink." "cheers, mate."
“我给你买了杯酒。”“谢谢，老兄。”
4. i appreciate it.
i/we appreciate这个表达形容我／我们对…非常感谢。
we really appreciate all the help you gave us last weekend.
你们上周末给予我们大力帮助，我们非常感谢。
5. i'm grateful for that/it.
你可以加一点副词，增强感谢的程度哦，比如：
i'll be eternally grateful to you.
我永远感激你。
6. it means a lot to me.
这个程度就更深啦，别人帮了大忙就可以这么说。
7. that was very kind of you.
it was great/awesome/thoughtful of you.
如果朋友做了很暖心的事情，以上的表达都很实用哦。
8. oh, you shouldn't have.
比如别人给你礼物时，用来表示你没有期待如此。
对应中文就是“你太客气了”，比如：
flowers! you shouldn't have!
“给我的鲜花！你不必送的！”
9. i don't know what to say.
形容激动地说不出话来。
（来源：沪江英语）