I think my wife is at the back of the line.
How would you know she is in the back of the line?
I have this strong feeling she's in the back of the line.
It is good to follow the rule when you wait in line. You should call her to make sure you know she is in the line.
No, I will not do it. I just have a feeling she's in the back of the line.
Okay, then it would be best if you just wait patiently for her to make her way through the line. Eventually she will get to the front and you can be with her again.