My friend and I were looking towards our boss and wondering when to enter his room to speak to him. Usually, a good indication of whether he is free or not is to check whether he is sitting down.
So my friend looks at me and asks me "Has he sit yet?"
To which I laughed and said, it's supposed to be "Has he sat yet?"/"Has he sat down yet?"
But she insisted that she was right, and now there is some money on the line. I wasn't able to get clear examples of this online. Which one is grammatically correct?