今日起Arthur老師（英語舌博主）會不定時陸續更新語法知識，解惑實際生活中的語法使用問題。
今天第一講：反義疑問句附加語 isn't it?
“John is smart, isn't it?”
這個疑問句裡的附加語（question tag）對嗎？如果是不對的話，錯在哪裡？
在公共場所或辦公室裡，只要稍為留心，不難聽到“ isn't it ?
”這個附加語。這種疑問句是英文幾種疑問句中的一種，主要的用途在強制答話人提供問話人心目中的答案。
這個疑問句有一定的格式，即：
肯定敘述句（affirmative statement）＋否定附加語（見例 ①及②）
否定敘述句（negative statement）＋肯定附加語（見例③及 ④）
1.Mary is happy, isn't she?
2.They will come, won't they?
3.Mary isn't sad, is she?
4.They won't come, will they?
此外，附加語中的代名詞（pronoun）和助動詞（auxiliary verb）必須和敘述句中的相符。
這類疑問句看似簡單，其實容易出差錯。其中一個錯誤便是附加語的時態（tense）不對，如：
5.You could hardly expect him to help you, can you?
6.The minister will talk about regional cooperation, wouldn't he ?
另外一種錯誤是助動詞的錯用，如：
7.The clerks are working hard, don't they?
8.Betty won't be a sportswoman, can she?
“isn't it”的濫用
最常見的錯誤來自“isn't it”的濫用，如：
9.Jason likes this book very much , isn't it?
10.She can sing well, isn't it?
11.Our team won, isn't it?
12.Young Singaporeans have become achievement - oriented , isn't it?
13.All our teachers are dedicated, isn't it?
14.They will go shopping on Sunday, isn't it?
這6個錯誤的附加語改正如下：
9.Jason likes this book very much, doesn't he?
10.She can sing well, can't she?
11.Our team won, didn't it?
12.Young Singaporeans have become achievement - oriented, haven't they?
13.All our teachers are dedicated, aren't they?
14.They will go shopping on Sunday, won't they?
" lsn't it ? "在下列3個句子中才是正確的用法：
15.It is fine today, isn't it?
16.That story book is interesting, isn't it?
17.It is worthwhile learning a second language well, isn't it?
現在再看看“John is smart , isn't it ?”錯在哪裡。很明顯的，錯在附加語裡的代名詞：應該 是“he”，不是“it”，全句如下： John is smart, isn't he?
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