There are some curtains at the windows.
Is the preposition "at" correct?
I'm not a teacher of English, but I have spoken it for (almost) all of my life....
I would probably say 'on.' (AmE)
You will also hear "in" in BrE.
I have curtains up in two of my windows and blinds in the other three.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
It's pretty strange that in AmE we can hear "on" whilst "at" and "in" we can hear in BrE.
So, my question is:
If I write a letter (my exam) and I want to use sentence like that, what should I use exactly?
Anyway, I'd say "I have beautiful certains in my window". But my question is quit interesting.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.