初中英语时态知识点：一般疑问句的几点注意事项
一般用什么问就用什么来回答。但以下例外：Is this a pencil?Yes , it is./ No, it isn't.
Is that your backpack?Yes , it is./ No, it isn't.
Are these your parents?Yes, they're./ No, they aren't.
Are those Jim's brothers?Yes, they're./ No, they aren't.
当句子中没有be动词，也没有情态动词时，变一般疑问句时，在主语前加助动词do (I, we, you,以及复数), does（第三人称单数she,he,it等）变成问句；
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