PLACEZ LE POINTEUR DE VOTRE SOURIS SUR LE TEXTE SOULIGNÉ POUR VOIR UNE EXPLICATION
𝔸 woman got on a bus, holding a baby. The bus-driver said, "That's the ugliest baby I've ever seen!"
The woman slammed her money down and went to sit at the back of the bus. The man next to her sensed that she wasn't happy and asked her what was wrong.
"That bus driver just insulted me," she fumed.
The man sympathized and said, "Why, he's a public servant and shouldn't say things to insult passengers."
"You're right," she said. "I think I'll go back there and give him a piece of my mind."
"That's a good idea," the man said. "Here, let me hold your monkey."
She went to sit at the back of the bus. She didn't go to sit on or in the back of the bus. You might hear in the back, to me it means in the general area in the back of something like a bus or classroom. We use at with precise points, like when we say at the corner. They're one dimensional and are considered to be points. This gives us melatonin, the sleep hormone, or (mel)atonin, or (mel) + (at on in). That's how you can remember the usage, from small to medium to large. Consider: