My biggest challenge in the English language is to understand when and how to use the indefinite article. I know that I need to use the indefinite article for a single noun that is countable. But some of the nouns are not really countable, but still require the indefinite article in front of them. For example...
a [fiduciary] duty
a conflict [of interest]
a [full] disclosure
a breach [of the duty]
a right [to inspect]
How do I know whch noun require the indefinite article if it is not really countable?
I don't understand. You give examples of countable nouns e.g.
a [fiduciary] duty /duties
a conflict [of interest] /conflicts
a [full] disclosure/disclosures
a majority /majorities