Question

use of a and an when necessary
_ cheese _ butter _ iron and milk are substance​

Answer 1

Answer:

a cheese a butter an iron

Answer 2

Use of 'a' and 'an' where necessary

_ cheese _ butter _ iron

Answer:

A cheese

A butter

An iron

Articles:      

There are two kinds of articles in English grammar.      

1) Definite article (The):      

• The definite article "The" is used before a singular noun that is a specific or particular noun.

2) Indefinite article (A/An):      

• Article "A" is used before an unspecific singular noun that begins with a consonant sound.  

• Article "An" is used before an unspecific singular noun that begins with a vowel sound.