Kim pretends to be a diligent student in front of the teacher, but when the teacher is not around, she would ask other people to show her the answers to the homework or copy their notebook, she isn’t serious at all.
I don't like my brother who acts like a good boy in front of my mother.
Why do you blame the car and pretend to be the victim after running over people
My sister acts elegant in front of everyone, but at home she is not elegant at all.
What's the matter with you, you're still a kid and you're acting like an adult?
Don't leave me hanging, just tell me!
He acts like he's a nice guy, but he's really a jerk.
There are people who really act like a senior when a newcomer joins.