Примеры

стало известно - it became known
ему известно, что - he knows that, he is aware that
как известно - as is (generally) known
насколько мне известно - as far as I know, to the best of my knowledge
насколько мне известно - нет - not that I know of
хорошо известно, что - it is well known that
всем известно, что - it is common knowledge that
да будет вам известно - be it known to you
известно кто [куда, какой и т.д.] - you know who [where, what, etc]
куда он пошёл? - Да уж известно куда! - where did he go? - There's no doubt about where he went!
без денег, известно, никуда - there's clearly / certainly no getting anywhere without money