Why use an in front of the words idea or easy which start with consonant?

You're right, we don't use "an" in front of words like "idea" and "easy" that start with a consonant sound.

The reason is that "an" is used before words that begin with a vowel sound, not just a vowel letter.

Here's why:

* "Idea" starts with the consonant sound /aɪ/ (like "eye"). It's the vowel sound that determines whether to use "a" or "an".

* "Easy" also starts with the consonant sound /i/ (like "ee").

Therefore, we would say:

* "a" great idea

* "an" easy task

The same logic applies to other words:

* "a" unicorn (starts with the consonant sound /j/ like "you")

* "an" hour (starts with the vowel sound /aʊ/ like "ow")

Let me know if you have any other questions about using "a" or "an"! 😊