1. I am searching the differences between when, while and as in this and other website. I still don't get what are they?
2. I am searching the differences among when, while and as in this and other website. I still don't get what are they?
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Are between and among interchangeable ?
Ju
No, they are not.
You need to say
'I am searching for the differences between when, while and as.'.
(OED)between
preposition
4
indicating a connection or relationship involving two or more parties:
with reference to a choice or differentiation involving two or more things being considered together:
you have to choose between two or three different options.
Rover
See this FrazeIt site for more examples than you could possibly need:
http://fraze.it/n_search.jsp?q=among&l=0&t=0&sugg=off
Rover
As a non-native I think I understand your confusion. Teachers often explain this automatically: between for two and among for three or more. And it's probably OK to avoid confusion at an early stage, when students are learning the basics, but further on they should be taught that it's not that simple.
One day I found myself using between for more than two and it felt natural, so I started to pay attention to how natives used it and I realised it wasn't wrong, depending on the circumstances.
Some further reading (scroll down the the fourth paragraph):
Non-Errors
Not a teacher
You can see me in this photograph standing betweenamongmy aunt and uncle.
The river runs betweenamongthose two hills.
There is a ten-minute break betweenamonglessons.
The village of Meonstoke is betweenamongWinchester, Southampton.and Portsmouth.
I divided/shared the sweets betweenamongLuke and Emma.
I divided the sweets between/among my six nieces and nephews. (Some people claim this must be among, but between is commonly used.)
Agreement has been reached betweenamong (?) the four parties.
You can see Lindsay there,betweenamong all the visitors.
Your watch is somewherebetweenamong all the mess in your bedroom.
Jimmy Carter stands outbetweenamong American presidents as the one who ....
What is the difference betweenamonggold and golden?
What is the difference betweenamonggold, golden, gilded and gilt?