how to use 여요 and 이여요 and when is the time to use it?

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it's usual to say '예요', instead of '여요','이여요'... hh '여요'&'이여요' are written expressions..

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oh.thank you.i just confuse because there are so many 요  at the end of word

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요 is used to show 'basic' respect to the listener, the listener could be older or younger than you.

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oh.so even if i don't use it.it will be ok right?i thought that 요 is need to show the polite to elder

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theseday we hardly use '여요 '이여요' but '예요'and '이예요'
ex) what is it? "이게 뭐예요?" 
     who is it? '누구세요? it's me "나예요"