0 past simple and past participle of ascertain --
1 to discover something: --
The police have so far been unable to ascertain the cause of the explosion.
[ + question word ] Have you ascertained whether she's coming or not?
[ + that ] I ascertained that no one could overhear us before I told Otto the news.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.