be grateful for sth 这个是固定搭配，因为He was generous with his time,看做是个整体，所以for要提前，还原就是I was grateful forXX（He was generous with his time看做整体 放后面）
be grateful for sth 这个是固定搭配，因为He was generous with his time,看做是个整体，所以for要提前，还原就是I was grateful forXX（He was generous with his time看做整体 放后面）