You can't really show what a character is thinking in a movie. You can show their actions. So you have to find a physical action to illustrate how a character feels.
Some movies also use fantasy sequences.
This is a tough thing to pull off, and works best in comedy. I wouldn't attempt this until after you've written a couple of good scripts. Very few films have fantasy sequences. I don't know what you mean about the clock. If there's anything you don't know how to do, make a list of recent films that did that thing then read the scripts for those films to see how they did it.