我们经常会碰到这种句式：“你喜欢这个，是吧？”“这很简单，不是吗？”英文中也有类似的表达方式——反义疑问句（tag question）。看起来简单，但说到“Isn't it?” 和 “Isn't that?” 很多人就犯糊涂了。比如下面这个句子你能看出哪里错了吗？

✘ Studying English is quite easy, isn't that?
有些人一看觉得没毛病，字都认识，但其实用错了主语！

一、什么是反义疑问句？

反义疑问句是一种附加在陈述句后面的简短疑问句，用来征求确认或表示礼貌。常见结构是：

• 肯定句 + 否定附加问句： She is your friend, isn't she?

• 否定句 + 肯定附加问句： He doesn't like coffee, does he?

而问题重点来了：如果句子主语不是传统的人名或代词，而是动名词、从句、不定式或this/that等结构时，我们到底该用什么作附加问句的主语呢？

二、核心规则

规则一： 句子的主语是动名词（doing）、不定式（to do）或名词性从句时，反义疑问句中的主语统一用 it。

• Studying English is quite easy, isn't it?
     学英语挺简单的，不是吗？（不是 isn't that！）

• To be honest is important, isn't it?
     诚实很重要，对吧？

• What she said was useful, wasn't it?
     她说的挺有用，是吧？

规则二： 当主语是 this 或 that，反义疑问句也用 it。

• This is your bag, isn't it?
     这是你的包，对吧？

• That was your idea, wasn't it?
     那是你的主意，不是吗？

规则三： 主语是 these 或 those，就要用 they。

• These are your books, aren't they?
     这些是你的书，是吗？

• Those were her plans, weren't they?
     那些是她的计划，对吧？

三、常见错误

四、例句

• This isn't your phone, is it?
  这不是你的手机，对吗？

• That sounds crazy, doesn't it?
  那听起来很疯狂，是吧？

• Reading in the dark is bad for your eyes, isn't it?
  在黑暗中看书对眼睛不好，对吧？

• Those aren't the keys you lost, are they?
  那些不是你丢的钥匙，是吗？

五、小贴士

要判断用 it 还是 they，不需要死记硬背，只要问自己一句：“主语是单数还是复数？”或者“它是具体的‘这些/那些’，还是抽象的‘这件事/那件事’？”

• 抽象/概括（这件事/那件事）→ it

• 具体可数的东西（这些/那些）→ they

练习题

1. 选择合适的反义疑问句填空：

1. This is your pencil, ______?
      A. isn't that　B. isn't it　C. is it
      答案：B

2. Those were their choices, ______?
      A. weren't it　B. weren't they　C. wasn't they
      答案：B

3. To finish this task by Friday is possible, ______?
      A. isn't it　B. isn't that　C. is it
      答案：A

2. 判断下列句子是否正确，若错误请改正：

1. This is exciting, isn't that? → 错，改为：isn't it

2. These are yours, aren't they? → 正确

3. What he meant was confusing, wasn't it? → 正确

3. 英译中练习：

1. Studying grammar is a bit boring, isn't it?
   学语法有点无聊，对吧？

2. This was his fault, wasn't it?
   这是他的错，对吧？

3. Those were your classmates, weren't they?
   那些是你的同学，对吗？

4. 造句挑战：

请用下面的提示写出完整的英文句子，并加上反义疑问句：

1. 主语：This is your umbrella
   → 答案示例：This is your umbrella, isn't it?

2. 主语：Those were nice photos
   → 答案示例：Those were nice photos, weren't they?

3. 主语：Reading aloud helps your pronunciation
   → 答案示例：Reading aloud helps your pronunciation, doesn't it?