The use of determiners is dependent on context. You must ask yourself what kinds of nouns each determiner is preceding. July, Benedict Arnold, Tallahachee Bridge. A noncount noun names something that is not considered countable. There are two main categories of noncount nouns.
Many nouns can be both count and noncount nouns.
The lonely boy ate his lunch in the janitor's room . The lonely boy ate his lunch and left room for dessert. Articles With Proper Nouns A or an never precedes a proper noun. The rarely precedes a proper noun, but there are some exceptions. With Singular Count Nouns A or an precedes a singular count noun when the reader cannot identify the noun, usually because the noun hasn't been mentioned previously.