感谢信英语作文别人为你举办了生日派对,也给你送了礼物,还为你唱了生日歌,为此你要表示感谢.

Dear First Name, (or Mr./Ms. Last Name)
熟的用Dear 名字,不熟用Mr./Ms. 姓,自来熟/装熟用前者.
Thank you for holding my birthday party and singing the song. I really like the ...(生日礼物) you gave me.
I appreciate all the things you've done for me. They are invaluable to me.
Again, thank you so much. I sincerely appreciate your generosity.
Best Regards,
名字

I will express my thanks to from my heart. You have held held a birthday party for me and sent me birthday gifts. Moreover, you sang birthday songs to me at the party. Thank you again for all that.