1. Appreciate (v.)
appreciate是很多人会在商用书信当中使用的单字，但其实使用上有很多需要注意的，首先要注意appreciate是动词，并不是形容词，所以“I’m really appreciated…”(X) 的这种写法是绝对错误的，除非你想表达「我真是受到大家的感激呢」的意思，所以千万要记得appreciate只有动词的用法!
用法1.
appreciate + 名词。
这个名词必须为事，而不能是人。也就是不能像中文的说法一样，把人不能当 appreciate 的受词，千万小心要别用错啰！
I appreciate my teacher. (X) 错误示范，绝对不能这样写!
I appreciate Tom’s effort to the company .(O) 这样才是对的!
(我感谢汤姆对公司的贡献。)
用法2.
appreciate + V-ing
I appreciate having this chance to discuss with you about the future development of this company .
(我很感谢有这个机会能够和你讨论这间公司的未来发展。)
用法3.
appreciate that+ 子句
I appreciate that you spent your time talking to this kid.
(我对于你能花时间跟这个孩子说话感到十分感激。)
[小补充]
appreciate的其他意思及用法
(1) 欣赏；赏识；重视
He doesn’t appreciate those expensive wines which I bought for him.
(他根本不懂得欣赏那些我买给他的昂贵的酒。)
(2) 理解，领会；意识到
We appreciate the need for immediate action.
(我们充分意识到了马上采取行动的必要性。)
(3) 涨价；增值
The value of our house has appreciated by 50 percent in the last two years.
(过去两年内我们房子的价格上涨了50%。)
[特殊用法]
sb. would appreciate…
用于礼貌地请求某事，意即如果能够…将不胜感激
(used when you are politely asking for something)
举例而言:
I would appreciate it if you could let me know in advance whether or not you will be coming.
(如能提前告知能否前来，我将不胜感激。)
(参考资料: Cambridge dictionary、【商用英文】thank, thankful, grateful, appreciate 怎么用？职场大进击，说「谢谢」一点也不难!)
2. Thank (v.)
thank (someone) for something
简单来说就是thank 某人 for 某事。
中间某人的部分可以省略，但是重点在后面的 for 不可以省略喔！
举例而言:
Thank (you) for your assistance.
(感谢你的协助。)
Thanks for your friendly reminder.
(感谢你善意的提醒。)
[小补充]
Thank you for your time and consideration and I am looking forward to speaking with you about the employment opportunity.
这句在求职信 (cover letter) 中也非常的好用喔!
3. Thankful (adj)
用法1.
sb be thankful (to someone) for sth.
简单来说就是: 人 be thankful ( to 人) for 某事
举例而言:
Mary is thankful to John for the help.
(玛莉很感激约翰的帮忙。)
用法2.
be thankful that+子句
举例而言:
I was thankful that I have got this job .
(我很庆幸自己有这份工作。)
[小补充]
Thankful除了表示觉得很感谢或感恩，也经常用于形容经历过不愉快的经验之后而感到的宽慰与感激，在此的用法更接近「还好、庆幸」这类的意思，而非表达感谢他人的行为。
举例而言:
I was just thankful that no one was hurt in this accident.
（我只是很庆幸没有任何人在这场事故中受伤。）
4. grateful (adj.)
用法1.
be grateful (to sb) for sth。
I’m so grateful (to you) for all that you’ve done..
(我很感谢你为我所做的一切。
用法2.
be grateful to V。
I’m grateful to be the new manager.
(谢天谢地，我要成为新的经理啦！)
用法3.
be grateful that + 子句。
I’m just grateful that I don’t need to do that job any more.
(感谢老天！我终于可以不用再做那份工作了。)
[小补充] thankful和grateful两者之间的差别：
Grateful：真心感谢他人的帮助。
Thank you so much for helping us move house. We are so grateful.
（谢谢你帮我们搬家。我们真的很感激。）
Thankful：还好、庆幸坏事的没有发生的感谢
I was thankful that the meeting didn’t last long, because I had to get home.
真庆幸会议没有延迟太久，我得赶回家。 ）
(参考资料: 一样是「感谢、感激」，thankful和grateful的差别是……)
看完了以上感谢用法的比较，是不是很想实际用在感谢信中呢? 那就让我们进入以下超实用的英文感谢信教学吧!
如果你想写一封简单的感谢信，开头可以使用“ I would like to thank you for…”，类似的句式还有“Thank you for spending so much time with me during…”，又或是“I’m so grateful for your kind hospitality”。再具体加上你所感谢对方的行为和事件。最后在结尾，可以再次向对方表示感谢，比如“Thank you again for your time.” 或 “Thank you again for your generosity.”。
英文感谢信常用句型:
1. I would like to thank you for …
我想感谢你的…
2. Thank you so much for your generous hospitality.
非常感谢你慷慨的款待。
3. Thank you ever so much/ most sincerely/ indeed.
非常／最真诚地感谢你。
4. I wish to express my sincere / grateful / profound appreciation for…
我希望表达我真挚的／衷心的／深切的感谢…
5. It was charming/ thoughtful of you…
承蒙盛情／关心…
6. Believe me, I am truly grateful for…
相信我，我真正的感激…
7. I regret very much that I did not have an opportunity to thank you personally for…
未能有机会当面道谢，深表遗憾…
