tommy isn't a hardworking student,for it is the third time h

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tommy isn't a hardworking student,for it is the third time he has been late,___
答案是isn't it
求高手给一个易懂的解释,不要凭语感觉得哪是重点
我感觉不出来啊给合理有根据的解释

有两点注意:
1.这是个并列句,反意问句在哪个分句,就应该和哪个分句的主谓语保持对应关系
这里,反意问句在后一分句 it is the third time he has been late
2.反意问句一般得和主句中的主谓语保持对应关系,（I think/suppose .+ 句子除外）,这里是 it is the third time
再问：多谢你的回答想问下只有I think 此类用法例外吗还有没有别的
再答：还有 I hope ...也是。其实，千万别死记一些规则什么的，关键是理解。比如说 I think he is a student, isn't he? 我肯定不会问don't I (我是这样想的吗？）。怎么样想，还要问别人？！：）

tommy isn't a hardworking student,for it is the third time h 英语翻译john isn't a diligent student,for it is the third time h john isn't a diligent student,for it is the third time he ha It is time to make a llan for the 7-day h_____,isn't it? Isn’t this the third time that you ___ late for school this Tom,isn't it the third time that you ____ here to Beijing,as a third 原题：Two days isn't enough for me to finish the work,I —John is a hardworking student． mary is very lazy ,for it is the third time she has been lat It is never good to waste time for playing,isn't it? The report is well written,isn't it A I'm afraid it isn't .B It is the third time for Zidane ______ (win) "World Player o