Using of use and usage :)

[Tamara]

Hi

[Mister Micawber]

.
1) when usage and use should be used with (indefinite) article? (as in (2) and (3)) -- As with other nouns that can be countable or uncountable, use the indefinite article when it is an unspecific or non-previously-mentioned, etc, countable noun.

2) more clearly - the difference between use and usage when they are used without article, (1)-- the difference is not related to countability. In language, usage is established use; use is pragmatic usage. Actually, however, they are cavalierly mixed by most writers (including me).
.
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Native English teacher at Mister Micawber's

[Tamara]