The modal verb sollen expresses a necessity that is the result of a request/command addressed to the verb's subject by a third party.
| Examples | request/command addressed to the subject: |
| Ich soll einkaufen gehen. | Meine Mutter sagte zu mir: "Geh einkaufen!" |
| Ich soll Sport treiben. | Mein Arzt sagte zu mir: "Treib Sport!" |
This request/command can derive not only from a person but also from something abstract, like social norms. In this case, it expresses a necessity that is attributed to moral duty or regulations.
| Examples | request/command addressed to the subject as |
| Du sollst ehrlich sein. | a moral duty |
| Man soll seinen Hund an der Leine führen. | regulation |