误 I have nothing to thank for.
正 I have nothing to thank anybody for.
析thank是及物动词,不可没有宾语。
谢谢您的来信。误 Thank your letter.
正 Thank you for your letter.
析thank的宾语须是人,而不可是事或物。
谢谢您照看我的孩子。误 Thank you for your looking after my child.
正 Thank you for looking after my child.
析thank you for后跟名词时,须用your修饰,但跟动名词时,动名词前不必用your。