The Correct Usage of 'An' in English Grammar

I saw an elephant at the zoo. The correct answer to fill in the blank in the sentence 'I saw an elephant at the zoo' is A. an (elephant). 'An' is used before words that start with a vowel sound, which 'elephant' does. 'Those' and 'these' are inappropriate in this context as they are plural demonstratives. This is because the word 'elephant' starts with a vowel sound and when a word starts with a vowel sound, we use 'an' before it according to the rules of English grammar. Option B. 'those elephant' and C. 'these elephant' are incorrect because they are plural demonstratives and do not fit well in this singular context. The right answer is A.

Why is 'an' used before the word 'elephant' in the sentence 'I saw an elephant at the zoo'?

'An' is used before words that start with a vowel sound, and 'elephant' starts with a vowel sound, hence 'an elephant' is the correct usage in this context according to English grammar rules.