Internal is between one and themself. It could be you trying to make a difficult choice. External includes everything you interact with (people, nature). It may be a conflict like you fighting with another person
Her early interest in airplanes foreshadowed her later career as a pilot. The hero's predicament is foreshadowed in the first chapter.
Completing a high school education can increase your expected income by more than $8,000 compared to not earning a high school diploma.
Can I have the words and purpose, or a screen cap of the question?