Question tags are very common in spoken English. They make conversation sound more natural and friendly. The rule is simple: if the statement is positive, the tag is negative. If the statement is negative, the tag is positive. Also, use the same auxiliary verb. 'It is cold today, isn't it?' — positive statement, negative tag, auxiliary 'is'. 'You don't agree, do you?' — negative statement, positive tag, auxiliary 'do'. Question tags can be used to start conversations, confirm information, or seek agreement. They are much more common in speech than in formal writing.

💡 Did you know? Welsh English speakers sometimes use 'isn't it' (or 'innit') as a universal question tag regardless of the verb — 'You're coming, innit?' This regional variation has spread into informal British English generally.