Is there only one way to say hello in Arabic?
Nope, there are many ways to say hello in Arabic. Most of them have a blissful meaning as well! Quite interesting!
what is the difference between prepositions "on", "in", and "at" in English language?
words referring to LOCATION: "on" = "on top of", "on the front surface of" or "traveling for" "in" = "inside of" or "attending" "at" = "near", "visiting", or it is used for events / entertainment (indoors or outdoors), or for locations where the purpose is more important than the building With locations that have a specific purpose, you use "at" when you are talking about the purpose and "inside" when you need to talk about the building itself. In English, there are always exceptions to the rule. But these are good, general guidelines that should help with many of your problems of usage.
In order to add a backdrop you first need to click what item in the "Instances" box first?