Last year my uncly went on a very interesting travel in South America.
It is said that "travel" should be replaced with "journey" because travel never takes "a". I just don't understand why!
The indefinite article is connected with the adjective (as in "a merry Christmas"), isn't it?
My second question is associated with the preposition used in front of "South America". Why isn't "to" or "into" used instead?
Maybe 'a Merry Christmas' and my use of Christmas is a shortened "Christmas season".
You are right... I was mistaken. I thought it was uncountable as I have never heard the (or an? which article should I use here?) expression "Christmases".
Anyway, according to this Cambridge Dictionaries Online - Cambridge University Press it is countable or uncountable. I just don't understand when (under which terms and circumstances) it is considered countable... How can I recognize it?