0 used to show that something is in a position above something else and touching it, or that something is moving into such a position: --
1 covering the surface of, being held by, or connected to something: --
2 used to show when something happens: --
What are you doing on Friday?
My birthday's on 30 May.
Would you mind telling me what you were doing on the afternoon of Friday the 13th of March?
The bells in the clock tower ring every hour on the hour (= at exactly one o'clock, two o'clock, etc.).
She was dead on arrival (= dead when she arrived) at the hospital.
Please leave your key at the reception desk on your departure from (= when you leave) the hotel.
3 used to show where something has been written, printed, or drawn: --
4 used for showing some methods of travelling: --
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.
We kunnen het stap voor stap voltooien, hoe lang de weg ook is en het kan niet worden voltooid, hoe kort de weg ook is, als je niet eens je voetafdruk markeert.