嘛

Make a criticism [comment, suggestion] if you want! 有意見(jiàn)就提嘛!

He's not to blame. After all, it was the first time he'd done it. 這也不能怪他，頭一回做嘛。

As for you, I don't think you have to go in person. 你嘛，就不用親自去了。