I am currently studying English and as such enjoy reading English books from time to time; for instance I have recently been reading the fifth book of A Song of Ice and Fire since the French version was not to be released anytime soon.
As I read it I often came across a grammatical form I had never encountered previously, this form being the usage of "for" to introduce propositions as per this example:
"We must learn english, for it is one of the most widely-spoken language."
My question if the following: is this form correct (I do think it is), and if it is then is it still used today? I really like this usage of the "for" preposition but still, I'd like to be sure it can be used before actually using it (in class or elsewhere).
Thanks!
EDIT: Upon further searches, now knowing that "for" is in that case a conjunction, I found out that this form is perfectly correct - though it is more of a literary form.