be angry with sb.on sth.在某一特定的事情上和某人发火，比如在不叠被子这件事情上。be angry with sb about sth.在某一类事情上和某人发火，比如在内务整理方面上。
双语例句
1、She had every right to be angry.
她完全有理由生气。
2、She was worried that my grandfather would be angry.
她担心我祖父会生气。
3、He had every reason to be angry.
他完全有理由感到愤怒。
4、Don't be angry with her.
别生她的气。
5、This was their mother at her worst. Her voice was strident, she was ready to be angry at anyone.
这是他们的母亲情绪最坏之时，她说话咄咄逼人，随时会对任何人发火。