What's the difference between 이에요/예요

이에요 / 예요

if front word has a final consonant, you can use "이에요"
but if don't have final consonant, you can use "예요"

ex> 저것은 연필이에요 (that is pecil)
 필 = ㅍ + ㅣ + ㄹ. so 필 has final consonant "ㄹ"
so you can use "이에요" next to "연필"

ex2> 이름이 뭐예요? (what's your name?)
뭐 = ㅁ + ㅝ . finished in vowel. don't have final consonant.
so you can use "예요"

 But there are exceptions.
"아니에요"
"아니" doesn't have a final consonant but with "에요"

and you can use it for the name of person

ex> 저 사람은 누구니? (who is that?)
       유민상이에요 ( he is 유민상)

ex2> 저 사람은 누구니? (who is that?)
         최민수예요 ( he is 최민수)

however, when you call the person using name + 이
like 민상이(instead of 유민상)
"민상이" is another word.
so 민상이예요 is correct
(because 이 doesn't have final consonant)