[Haskell-beginners] Do IO actions *have* to be glued by the do syntax?

Hello List, Do IO actions *have* to be glued by the do syntax? Many, if not all, the examples that I've come across in LYH seem to suggest so. And if so, why? BTW, if possible I'd appreciate an explanation that does not resort to monads. I haven't studied them yet and I'm sure I'd struggle to understand any explanation that resorts to monads. Thanks, - Olumide