A:
§Is used in singler or countables nouns.
§Is used with a consonant sounds.
§Is NOTused with pluras or uncontables.
Examples:
§A cat
§A bird
§A child
§a doctor
An
§Is used in singular noun beginning with a vowel.
§Nouns starting with silent "h”.
Examples:
üan egg
üan apple
üan ant
üan orange
The
§Is used in all the nouns to describe or someone
or something specific or unique.
Examples:
vThe earth
vThe world
vThe sky
vThe air
vThe weather