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.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.