三個(gè)感謝單詞用法各不同
(adj。) thankful (unthankful); (n。) thankfulness
thank作為及物動(dòng)詞，常用搭配是thank sb (for sth / for doing sth)，如：
She said goodbye and thanked us for coming。
thank表示“感謝”，習(xí)慣上只接“人”作賓語，而不能接“事”作賓語：
正：Thank you for your help。
誤：Thank your help。
另外的用法：
1. have sb to thank for (doing) sth 歸功于，如：
I have my parents to thank for my success。
2. thank your lucky stars 感謝你的幸運(yùn)之星，口語中用于表達(dá)幸運(yùn)，尤其是躲過了不愉快或危險(xiǎn)的事。如：
Just thank your lucky stars you weren't in the house at the time。
appreciate
(adj。) appreciative (inappreciative); (n。) appreciation
appreciate作為“感激”解釋時(shí)是及物動(dòng)詞，常用搭配：appreciate doing sth，后跟動(dòng)名詞或代詞it代指的事情。習(xí)慣上只能接“事”作賓語(object)，而不能接“人”作賓語：
正：I'd appreciate some help。
誤：I'd appreciate you for some help。
appreciate也指“欣賞”，有“對(duì)某事物有一定的興趣及認(rèn)識(shí)”的含義，如：
In time you'll appreciate the beauty and subtlety of this language。
此外，在商業(yè)書信來往中，appreciate一字出現(xiàn)率頗高，但其意和上面提及的“欣賞”音樂有所不同;如：
We greatly appreciate your getting the goods to us at such short notice。
在這句里，“We greatly appreciate.。。”和“Thank you for.。。”含意相同。
appreciate的第三個(gè)意思是“(對(duì)一種情況或問題的)理解”，如
I fully appreciate your concern. We will do all in our power to help。
appreciate的另一用法是指某東西“增值”，是不及物動(dòng)詞，如：
Their investments have appreciated over the years。
大家有沒有留意到appreciate解作升值時(shí)是不需接賓語(object)的?
grateful
(反)ungrateful; (n。) gratitude (ingratitude)
grateful沒有相應(yīng)的動(dòng)詞，它的常用搭配是be grateful to sb for sth，或者后面跟不定式或that從句，如：
I am extremely grateful to all the teachers for their help。
She seems to think I should be grateful to have a job at all。
He was grateful that she didn't tell his parents about the incident。
另外，grateful也可用于表達(dá)請(qǐng)求，這種用法在書信或者其他正式場(chǎng)合用得比較多，如：
I would be grateful if you could send the completed form back as soon as possible。
除了上述的用法區(qū)別之外，thank, appreciate和grateful在表達(dá)情感上也有略微的區(qū)別：
"When you are 'grateful' to someone, you can sometimes feel a little 'beholden' to them. It creates a feeling of 'owingness'." 也就是說grateful帶有一點(diǎn)“義務(wù)”的性質(zhì)。
而另一方面，"When we appreciate someone or something there is a feeling of ending. There is a feeling of finality. We do not feel the need to pay this person back." 當(dāng)我們用appreciate有點(diǎn)意味著這件事的結(jié)束，不需要再做什么回報(bào)。
另外，oblige (vt。) 一詞也有“使感激”的意思，如：
I'm much obliged to you. 我非常感謝你。
不過oblige更常見的含義是“迫使”，如：
Parents are obliged by law to send their children to school。
