ATONIN

Imagine a pyramid 

 

A pyramid invented by Marcelo Montecinos, creator of Phrazzle me

	At the top of the pyramid you have “AT”. You use it for the smallest in time: hours I’ll see you tomorrow AT 5 p.m.
	In the middle of the pyramid you have “ON”.  You use it for bigger time: days Let' s go out ON Sunday.
	At the bottom you have “IN”. You use it for everything else that is bigger than hours or days I was born IN 1978. My birthday is IN January. I was a teenager IN the 90's.