Question

Fill with articles, copper is ___ useful metal

Answer 1

Copper is a useful metal. In this case, the rule to be applied is that ‘a’ is used before words starting with a consonant and words having consonant sounds in the beginning.

Here, the word ‘useful’ has a ‘yoo’ sound in the beginning, and therefore, despite it starting with a vowel ‘u’ is supported by ‘a’ and not ‘an’.