Using a or an depends on the sound that begin with next word.
Use of 'the'
The errors in the use of Articles
Naming words Describing words
How plurals are formed
- Quality of person/things
- Colour of things
- Nature of places
Talking about Manner/Place/Time
The position words / Linking words
Relate words - words that show possessiveness and replacing nouns
Placement words, Helping verb
Past form of action word
Finished events connected with the present.
Let, Let us and Let him / them
'To' and '-ing' forms
Little and Few
Direct and Indirect
Join words - words that continue a sentence
Exclaim Words - words that show emotional sounds