我对你所有的帮助真的非常感激。

I'm really ___grateful to you for all your help.

如果你能立即把书寄给我，我将不胜感激。

I would be most ___grateful if you would send me the book immediately.

我对那些建立了俱乐部的男孩们心存感激。

I'm ___grateful to the boys who established the club.