Let's delve into sollen, a very important modal verb in German. Sollen is used to convey advice, recommendations, or instructions that come from someone else. This means you are advised or tasked to do something, rather than it being your personal wish. For instance, "Du sollst mehr Wasser trinken." translates to "You should drink more water" (it's a recommendation). Another example is "Ich soll meine Freundin anrufen.", meaning "I am supposed to call my friend" (I've been told to). Remember, sollen always communicates an external opinion or task. Keep practicing!