English Articles and "Negative" Quantifiers

used when we want to talk about a person or thing for the first time or when other people may not know who or what they are

used before a singular noun that starts with a vowel sound, when we are not talking about a specific person or thing

used when referring to a person or thing that was previously mentioned or one that is identified easily

used to say there is none of something

not any of the members of a group of people or things

used to say that it does not matter which individual or amount from a group is chosen or referred to

used to indicate the absence or lack of something