Englishfor English speakers
assume
Verb
—
If you assume something, you think or believe something without having enough information to know that it's true.
Oh, hello. I assume you're the new student, are you?
If I saw a man dressed all in black, holding a gun, and walking toward me, I would assume that the man is really a dangerous guy and I would run away from him.
I saw your car in the garage, so I assumed you were at home.
obligation
Noun
—
An obligation is a duty, something you must do.