Question

I have .....spare book​

Answer 1

I have a spare book.............

Answer 2

Answer:

I have a spare book

Explanation:

The use of the Article is before a noun. A and An is known as the indefinite article. A/An is used before a Singular Countable Noun. We put A or An according to vowel and consonant.

If the word starts with "a vowel", then we use An and if it starts with "a consonant" then article A is used. Here, the word spare has consonant sound. So, we use "an article A". so, the correct sentence is I have a spare book