Understanding Articles:

1. Pearl is obtained from ____ oyster. (a/an/X)

2. ___ baby should not be left alone in ___ room. (a/an/X)

Please give reason why we choose that article.

1. Pearl is obtained from an oyster. (a/an/X)

2. A baby should not be left alone in a room. (a/an/X)

Words strating with a vowel sound (sound of 'a, e, i, o, u) get 'an' before them.

Words starting with cpnsonant sounds get 'a' before them.

Both, 'a' and 'an' imply a singular object.