We are very grateful to you for what you have done. (我们对你所做的一切表示感谢) 句型:be grateful to sb.for sth. we是主语;very grateful是be动词的表语;you是be very grateful to的宾语;for(表原因) what you have done是介词短语做状语. 整个句子你可以看成是一个主谓宾结构也就是把be very grateful to看做是一个谓语 可以写成: For what you have done,we are very grateful.