Question tags are commonly used in English conversation. They are used to form true questions with a rising intonation or to seek agreement with a falling intonation. The question tag matches the first part of the sentence - if the first part is affirmative, the tag is interrogative-negative, and if the first part is negative, the tag is interrogative-positive. Question tags are formed by using an auxiliary verb from the main clause. There are some irregular question tags such as "shall we" and "won't you".
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