congratulate

1.congratulate后面接指被庆贺的人的词，那表示事件的词的前面通常用on，偶尔用for。例如：I congratulate you on（偶尔用for）your graduation和He wrote to congratulate her on（偶尔用for）being chosen as a model worker。

2.下面两句意思相同：

I congratulate you on producing a new English grammar.

I congratulate you on having produced a new English grammar.