We usually use a/an before singular countable nouns, but not plurals nor uncountable nouns. The bowl contained an apple, a pear and a peach. (Countable singular) The bowl contained apples, pears and peaches. (Countable plural) This dessert is available in the following flavors: apple, pear, and peach. (Uncountable) In your examples you would include the a/an, w