What are the rules of articles ( A, An ,The ) in English grammar?

Introduction : 

Hello friends today I am going to teach you rule of articles and I will give you information about A, AN , The . I hope you will like this and it's helpful for you .

1. We have three articles : 

* A  

* AN 

* The 

2. Rules : 

* If a singular countable noun , which is not specifie / definite , starts with a  consonant sound ,write ' a ' before it .

Example : 

* This is a chair .

* If a singular countable noun which is not specifie / definite , starts with a vowel sound write ' an ' before it .

Example : 

* This is an apple . 

Important Note : 

* With ' few ' we also use ' a '  - a few books 

* We also use ' a ' with ' lot of ' - a lot of noise 

3. Rule of The : 

When we talk about one or more countable noun which are specifie/ definite , so we write ' the ' before it . 

Example: 

This is the phone I bought yesterday.

4 . Rule for use of ' The ' : 

* Do not use ' The ' before names of : 

. Most countries / territories : Italy , Maxico 

. Cities , towns or states 

. Streets

. Lakes 

. Mountain

. Islands

* Use ' The ' before names of : 

. Rivers, oceans and seas 

. Points on the glob 

. Geographical areas 

. Desert , Forests , Gulfs , and peninsulas

. Ranges of mountains

5. Important note : 

Use no article for names of : 

 . Languages and nationalities

. Sports

. Subjects