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

[Olumide]

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