Question

It is not_______ useful thing.(a,an,the)

Answer 1

Answer:

a will be used

Answer 2

Answer:

a

Explanation:

because An/A' is used as an indefinite article for a thing or person when the reader doesn't know which one we are referring to out of many nouns. It states the random nature of the subject.

'The' is used as a definite article for a thing or person when the reader knows which one we are exactly referring to. It states the specific nature of the subject.

with a word having a vowel sound, although in this sentence  'Useful' begins with 'U' ,a vowel  but it has a consonant sound.  is used for a particular noun