Using A / An / Some / The

 A vs An 

  • A is used before a noun that starts with a consonant sound.
  • An is used before a noun that starts with a vowel sound.

  • Note that the rule is not whether they start with a consonant or vowel, but whether they start with a consonant or vowel sound. This can help you decide which to use in difficult cases like words beginning in “u” or “h.

Both are used in from of singular count nouns. 
Ex. 
An animal
An aparment
An Elephant

Mr. Tang is an old man.*

We use "An" if the word that begins with "u" has a vowel sound:
an uncle, an ugly picture. 

We use "A" if the word that begins with "u" has a /yu/ sound: 
A university
A usual event

In some words that being with "h," the "h" is not pronounced. Instead, the word begins with a vowel sound and "an" is used: 
An hour
An honor. 

In most words that begin with "h," the "h" is pronounced. 
We use "a" if the "h" is pronounced.
A house
A hotel


Using A/An vs Some

A and An are used in front of singular count nouns. 

I have a pen. 
I have an 

Some can be used in front of plural count nouns
Ex. 
I have some pens

Some can ALSO be used in front of noncount nouns
Ex. 
I have some rice.



Using "The"

We use "the when the speaker and the listener have the same thing or person in mind. In other words, "The" is to show that a noun is specific (not general).

it is used with 
- singular and plural count nouns. 
- noncount nouns

With the three kinds of nouns. 

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