the man was grateful 什么mr li 什么his help 两个用什么介词

问题描述:

the man was grateful 什么mr li 什么his help 两个用什么介词

be grateful to sb.for sth.
因某事而对某人感激
单用的话
be grateful for是“为...
be grateful to
所以
The man was grateful to mr li for his help .