疑问附加语 isn't it
"john is smart, isn't it?"
这个疑问句里的附加语（question tag）对吗？如果是不对的话，错在**？
在公共场所或办公室里，只要稍为留心，不难听到“ isn't it ? 这个附加语。这种疑问句是英文几种疑问句中的一种，主要的用途在强制答话人提供问话人心目中的答案。
这个疑问句有一定的格式，即：
肯定叙述句（affirmative statement）＋否定附加语（见例 ①及②）
否定叙述句（negative statement）＋肯定附加语（见例③及 ④）
①mary is happy, isn't she?
②they will come, won't they?
③mary isn't sad, is she?
④they won't come, will they?
此外，附加语中的代名词（pronoun）和助动词（auxiliary verb）必须和叙述句中的相符。
这类疑问句看似简单，其实容易出差错。其中一个错误便是附加语的时态（tense）不对，如：
⑤you could hardly expect him to help you, can you?
⑥the minister will talk about regional cooperation, wouldn't he ?
另外一种错误是助动词的错用，如：
⑦the clerks are working hard, don't they?
⑧betty won't be a sportswoman, can she?
“isn't it”的滥用。
最常见的错误来自“isn't it”的滥用，如：
⑨jason likes this book very much , isn't it?
⑩she can sing well, isn't it?
team won, isn't it?
singaporeans h**e become achievement - oriented , isn't it?
our teachers are dedicated, isn't it?
will go shopping on sunday, isn't it?
这6个错误的附加语改正如下：
⑨jason likes this book very much, doesn't he?
⑩she can sing well, can't she?
team won, didn't it?
singaporeans h**e become achievement - oriented, h**en't they?
our teachers are dedicated, aren't they?
will go shopping on sunday, won't they?
" lsn't it ? 在下列3个句子中才是正确的用法：
is fine today, isn't it?
story book is interesting, isn't it?
is worthwhile learning a second language well, isn't it?
现在再看看“john is smart , isn't it ?”错在**。很明显的，错在附加语里的代名词：应该是“he ”，不是“it”，全句如下：
john is smart, isn't he?
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