Grammar notes 36

ーてしまう indicates the completion of an action or event, although it often carries a sense of regret or annoyance. I can also, but it is not common, indicate a great sense of accomplishment.

ーてしまう　is often abbreviated to ちゃう for てしまう and ちゃった for てしまった.


ものだ　or もんだ is yet another way to put emphasis on a sentance, sympathetic emphatis.