Questions & Answers about Devo cucire un bottone sulla camicetta.
Devo means I must / I have to.
In Italian, the subject pronoun is often omitted because the verb ending already shows who the subject is.
- devo = I must
- devi = you must
- deve = he/she must
So Devo cucire... is perfectly natural and means I have to sew.... You could say Io devo..., but that usually adds emphasis, like I have to, not someone else.