The medicine doesn’t act on his illness.
You’d better act on my suggestion.
I don’t agree his plan, but I have to act upon his order.
The two children acted out the fairy tale.
I won’t blame him. I know he’s just acting out.
How long has your head been acting up?
His old Jeep acted up again.
Because I didn’t give her my cell phone, my niece started acting up.
He asked his assistant to act for him in this matter.
As the manager was ill, our boss asked me to act for him.
The doctor said that insomnia might act as a trigger for his illness.
I was asked to act as a negotiator at the meeting.