Some uses of 'A'

 

Note

Use 'an' instead of 'a' before a vowel or a silent 'h';
e.g. an axe, an egg, an inkpot, an owl, an uncle, an honest man.
But when 'u' & 'eu' sound like 'y', use 'a' and not 'an'; e.g. a union, a university, a European war.

General Use

He is brave	He is a brave man
The film was good	The film was a good one
It was hot	It was a hot day

 

Use 'a' in the following cases:

Make a noise	quite a good game	a large number of
Have a rest	a bit better	a great deal of
Have a bath	at a speed of	a large amount of
Go for a picnic	it was a good thing	a (one) hundred
Go for a walk	as a result of	a little later
Play a trick on	to a certain extent	a few days later
Make a fool of	a waste of time etc.	after a few days
Have a good time	in a majority	a kind (sort) of

Don't use 'a' in the following cases:

Enjoy good health	Have bad luck
Get employment (get a job)	Get hurt
It was great fun	It caused me great pain
Take exercise	What fun it was!

Note
Never use 'a' ·or 'an' before a word which has no plural. i.e. Never say: a work, a scenery, an advice, a news, a poetry.