This is the copula:
-이에요/ 예요
-i.e.yo/ -ye.yo

*If the word you are adding the copula to ends in a consonant you would use 이에요 (-i.e.yo).
*If the word you are adding the copula to ends in a vowel you would use 예요 (-ye.yo).
  • The copula means that something (noun) is something (noun); something is equal to something else.
  • The copula is a verb so it is always at the end of the sentence or clause.

Ex:
Chaek-i.e.yo.
Is a book.
  • You do not need to say "It is a book".
  • 이에요 (-i.e.yo) does not indcate the location of something (i.e. The book is on the shelf would not use the copula).

This is the negative copula:
아니에요
a.ni.e.yo
*아니에요 (a.ni.e.yo) is a separate word so it will always be (anieyo), regardless of whether the word you are adding it to ends in a consonant or a vowel.

Ex:
Chaek a.ni.e.yo
Is not a book

  • 아니에요 (a.ni.e.yo) means that something is not something.
  • It does not mean that something is not somewhere.