Question tags are short questions added to the end of statements. They are used in speech to confirm if something is true or encourage a reply. A positive statement is followed by a negative question tag, and vice versa. When forming question tags, the auxiliary or modal verb from the statement is used along with the appropriate subject. There are some exceptions, such as for verbs like "be", imperatives, and expressions involving "have got", "there is/are", and demonstratives like "this/that". Common question tags are provided for statements using the present simple and past simple tenses.