Below is a passage from Louis Sachar's book Crash. It shows the main character/narrator's "internal thinking." The boldfaced section is where the writing switches to "external events."
I feel strange
I’ve been feeling this way since last Wednesday, since I lost the race-off. Lost. If I say the word aloud, it makes me shiver.
At first it was a strange-bad feeling. The instant Webb broke the string, I regretted what I had done. As we slowed down, he turned to me. He was confused. I knew what he was going to say, “Did you let me win?” But then the team was mobbing him, and I jogged off the track. Three people still stood under the crossbar, smiling their faces off.
A Long Walk to Water Examples
I can't go to another country, Salva thought. If I do, my family will never find me...
One step at a time...one day at a time. Just today--just today to get through. pg. 82