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最佳答案：Yes,...is 译为 不,.No,...isn't译为 是的,.肯：Yes,it is.不,它开着.否：No,it isn't.是的,它关着.
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最佳答案：肯定句:His name is Mike.否定句:His name isn't Mike.一般疑问句:Is his name Mike?肯定回答:Yes,it
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最佳答案：回答必须和一般疑问句保持形式一致.即肯定回答是：Yes,he is.否定回答是：No,he isn't.
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最佳答案：Is your teleplone number 123?No,it isn't.My telephone number isn't 123.
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最佳答案：Yes,they are ,no,they aren't
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最佳答案：I was a student before.I was not a student before.Were you a stedent before?Yes,
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最佳答案：He was an English teacher last year.（肯定句)He wasn't an English teacher last year.