I guide a course on Memrise: http://www.memrise.com/course/43618/further-intermediate-french/. There I try to make all my substantives indefinite, because that's the best way to learn the gender of a word. However with some words, I 've never heard nor seen an indefinite form. Examples of this are:
Countries like la France, la Belgique, L'Australie ...
Sports like: le foot, le tennis de table ...
"liquid" objects like: l'eau, le sable, l'huile ... ...
- Do some of these have an indefinite form, if so, which?
- What are the rules about those things?
I asked this to make my course consistent. If all articles are consistenly indefinite (un, une) people know they always need to use this form (however the definite form is also accepted as an answer)