Noun markers are the words before nouns “a”, “an”, “the”.
The noun markers that refers to one thing in general are “An” and “A”.
The noun marker that “refer to more than one things specifically” is ” The”
Some examples of correct noun markers for one thing are an orange, a song, a book, and an eraser.
Some examples of correct noun markers for more than one thing are the birds, the pens, the children.