what difference can make between "With pleasure"and "It's my

With pleasure做副词,一般放在句末.
第一种意思是愉快地,高兴地.
如:I did the work with pleasure.
这份工作我干得很高兴.
第二种意思就是非常愿意.
例如:A:"will you come with us?"你也一块来吧?
B:"With pleasure."很乐意.
It's my pleasure (to do sth),做某事是我的荣幸,是我的快乐,
如:It's my pleasure to help you.
能帮助你是我的荣幸.
It's my pleasure to talk to her.
我很荣幸能跟她说话.