Let s talk about the usage of a and an in a nutshell, but it must be complete.

1. A is used in front of words that begin with a consonant letter, or a vowel that is pronounced as a consonant and begins with a brother's letter

For example: a man a man, a university a university, a hat a hat.

2. An is used in front of words that begin with vowel letters (a, e, i, o, u), or with the unpronounced letter h:

3. An is also used in front of a single letter that begins with a vowel sound

For example: an l plate a license plate that reads "Trainee Driver Driver Hidden Brother Drive", an MP is a member of Congress, and an SOS is a distress signal.

4. There is no change in sex in a an:

For example: a man is a man, a woman is a woman, an actor is a male actor, an actress is an actress.

A is used before a singular countable noun at the beginning of a consonant phoneme, e.g. a pen, a man, a ball.

an, on the other hand, is used before a singular countable noun at the beginning of a vowel factor, e.g. an orange, an elephant.

However, although the first letter of some words begins with a vowel letter, its pronunciation begins with a consonant phoneme, so the article in front of such a word cannot be preceded by an, but with a, for example, a university.

Although "university" starts with u, its pronunciation begins with a consonant factor, so it should be preceded by the article a.

On the contrary, although the first letter of some words begins with a consonant letter, but its pronunciation begins with a vowel phoneme, so the article in front of such a word cannot be preceded by a, but with an, such as an hero.

Although "hero" begins with a consonant letter, its pronunciation does begin with a vowel factor, saying that the preceding article should use an instead of a.

Notes on the usage of A and AN:

1) Spell words that begin with a consonant letter but begin with a vowel.

Although the spelling of words such as hour, honest, and honor begins with the consonant letter h, their pronunciation begins with a vowel, so an should be used in front.

2) Spell words that begin with a vowel letter but begin with a consonant.

Words such as useful, university, usual, united, european, one-eyed, one-way, etc., although they begin with a vowel letter, their pronunciation begins with a vowel sound, so they should be preceded by a.

3) Among the 26 English letters, the pronunciation of 12 letters a, e, i, o, f, h, l, m, n, r, s, and x begins with vowels, and the pronunciation of the rest of the letters begins with consonants.

In English, the indefinite articles and n both mean one, one. They are pronounced as and n respectively. But they are not used in the same way, first words that start with a consonant should be added , e.g. pen (a pen), book (a book).

Whereas words that begin with a vowel sound (, e, i, o, u) should be added with n, e.g. pple (an apple), n or nge (an orange). But there are some cases that are peculiar, the first is to start with an unpronounced letter, such as n hour (an hour), the opening letter of this word is h, not pronounced. And the pronunciation at the beginning is a, which is a vowel sound.

So add n. For these words, distractions should be removed to find the true opening pronunciation. The second case is the pronunciation of the letter u, we know:

There are three pronunciations of the letter u. They are ju: , u:

and If the letter u is pronounced ju: then it should be , because ju: is a transition from j to u:

, and j is a premature consonant, so it should be chosen. For example, UFOs (a UFO).

1. A is used in front of a word that begins with a consonant letter, or begins with a vowel letter that is pronounced as a consonant:

For example: a man is a man, a university is a university, a hat is a hat.

2. An is used in front of words that begin with vowel letters (a, e, i, o, u), or with the unpronounced letter h:

3. An is also used in front of a single letter that begins with a vowel and carries a brother:

For example: An L Plate A "Practice Driving" license plate, An MP a Congressman, An SOS a distress signal.

4. There is no change in sex in a an:

For example: a man is a man, a woman is a woman, an actor is a male actor, an actress is an actress.

The usage of a is different from an

1. Differences in usage.

A is used to pronounce a letter or word that begins with a consonant phoneme.

For example: a pen is a pen, a book is a book.

An is pronounced before a letter or word that begins with a vowel phoneme.

For example: an apple, an orange, an egg, an egg, an english book.

Second, the special usage of the slag loss.

1. Although the first letter of some words begins with a vowel letter, when its pronunciation begins with a consonant phoneme, the article in front of it cannot use an like the words that start with the general vowel letter, but should use the article a.

For example: a useful book.

2. Although the word useful begins with the vowel letter u, its pronunciation begins with the consonant factorjusf?l], so it should not be preceded by the article an, but by the article a.

3. Although the first letter of some words begins with a consonant letter, when its pronunciation begins with a vowel phoneme, the article in front of it should not use a, but should use an.

For example: an hour for one hour.

4. Although the word hour begins with the consonant letter h, its pronunciation begins with a vowel phoneme [a?r], so he should not be preceded by the article a, but the article an.

A and an are indefinite articles and are used as follows:

1. It is used to express "one" before the singular destruction of the remaining countable noun;

2. Generally refers to - humanoid or thing-like;

3. It is used before the ordinal number word, which is quite sharp and known as another;

4. Indefinite articles are used in fixed phrases.

Note: a is used before words that start with a consonant phonetically, and an is used before words that start with a vowel.

1. A is used in front of words that begin with a consonant letter, or a vowel that is pronounced as a consonant and begins with a brother's letter

For example: a man a man, a university a university, a hat a hat.

2. An is used in front of words that begin with vowel letters (a, e, i, o, u), or with the unpronounced letter h:

3. An is also used in front of a single letter that begins with a vowel sound

For example: an l plate a license plate that reads "Trainee Driver Driver Hidden Brother Drive", an MP is a member of Congress, and an SOS is a distress signal.

4. There is no change in sex in a an:

For example: a man is a man, a woman is a woman, an actor is a male actor, an actress is an actress.

a is a vowel, an is the consonant of a vowel, a is used if there is no vowel after it, and an is used before the singular number of countable nouns if there is a vowel, it should be noted that a is used in front of the noun at the beginning of the consonant; An is used in front of a noun at the beginning of a vowel. Everyone should note or group meaning clearly, vowel consonants, not equal to vowel letters consonant letters.

For example: a computer.

A and an are used before the singular form of a countable noun, and it is used to refer to a noun that is mentioned for the first time in conversation, for example, i need an English grammar book

I need a model orange English grammar book.

It can be used before a singular noun, of course, it is still a countable noun, indicating a class of people or things, which is more special, and it refers to the code shouting, for example:

a bike is very useful in the countryside

Bikes are useful in the countryside.