Articles

You already know how to choose between "a", "an", and "the". Now you will master two important patterns: how articles change when you mention something again, and when "the" is the only correct choice because something is one of a kind.

What You'll Learn

• How to use a/an for the first mention and switch to the for the next mention
• Why certain nouns always need the because they are unique (only one exists)
• How to track nouns across sentences and pick the right article each time
• How to spot unique referents in different contexts

When to Use

1. First mention of something new: "My neighbour adopted a dog last week." (We are introducing the dog for the first time.)
2. Mentioning it again: "The dog likes to chase birds in the park." (Now we both know which dog -- the one just mentioned.)
3. Something unique in the world: "The Earth travels around the sun." (There is only one Earth and one sun.)
4. Something unique in a place: "We walked to the canteen to buy lunch." (Our school has only one canteen.)
5. Something made specific by a description: "The boy sitting next to me is my cousin." (The phrase "sitting next to me" tells us exactly which boy.)

How to Form

First Mention vs Subsequent Mention

When you write about something, the first time you mention it, use a or an. After that, switch to the because the reader now knows what you are talking about.

Tracking Across Sentences

Look at how the article changes as the story continues:

Last Saturday, I saw a kitten near the void deck. The kitten looked hungry, so I gave it some food. After eating, the kitten fell asleep on a mat. The mat belonged to our neighbour.

Notice: each noun starts with a/an and then becomes the.

Unique Referents

Some things are one of a kind. They always use the because everyone knows which one you mean.

Key Rules

1. First mention = a/an: When a noun appears for the first time in a passage, use "a" or "an". "There was a spider on the wall." This tells the reader you are introducing something new.
2. Subsequent mention = the: Once you have introduced a noun, switch to "the" for every mention after that. "The spider started spinning a web." The reader already knows which spider.
3. Unique things always get "the": If something is the only one of its kind, use "the" even on the first mention. "The moon was shining brightly." There is only one moon, so everyone knows which one.
4. "Only one here" also gets "the": Even if something is not unique in the world, it can be unique in a place. "Please return this to the office." (The school has one main office.)
5. Descriptions can make a noun specific: When extra words tell the reader exactly which noun you mean, use "the". "The girl in the blue pinafore won the race." The phrase "in the blue pinafore" makes the noun specific.
6. Do not switch too early: If you are talking about a different item of the same type, use "a/an" again. "I saw a bird on Monday. I saw a bird on Tuesday too." (These are two different birds, so both need "a".)

Common Mistakes

Clue Words

Signals to use "the" (unique or already mentioned):

only, same, first, second, last, best, worst, most, tallest, biggest, next (the next day), following (the following week)

Signals to use "a/an" (new introduction):

one day, once, there was, there is, I saw, I found, I met, I bought

Phrases that show subsequent mention:

the same (noun), that (noun), this (noun) -- these show the reader already knows which one

Tip: When you read a sentence with a noun, ask: "Has this noun appeared before in the passage?" If yes, use the. If no, use a/an -- unless it is something unique like the sun or the moon.

Practice Tips

1. Track the noun: As you read a passage, circle every noun and draw an arrow from its second appearance back to its first. The first should have "a/an" and every later one should have "the".
2. The "only one" test: Before choosing an article, ask yourself: "Is there only one of this in the world, or only one here?" If yes, use "the" right away -- even on the first mention.
3. Read your writing aloud: After writing a paragraph, read it out loud. When you say "the", check that you have already introduced that noun, or that it is unique. If neither is true, change it to "a" or "an".
4. Watch for new vs same: If two sentences mention the same type of thing but they are actually different items (two different birds, two different books), each one gets "a/an" on its first mention.

Quick Reference