Much of this will be somewhat familiar to speakers of Asiatic languages. For example, Hindi, Japanese, and Arabic use tags at the end of sentences to alter their meaning.
Simply, in English, Question Tags are tacked onto the end of declarative (stating) or imperative (commanding) sentences to make them interrogative, these small phrases are used to transform a statement into questions.
Interestingly, Question Tags come across as an afterthought, but these phrases are intentionally placed. And, most often, Positive/Negative Question Tags are deployed by native English speakers when the listener is expected to agree.
For example, you may encounter an English speaker saying “It’s hot today, isn’t it?” It would be atypical to hear this on a day below 26℃ Celsius. The listener would reply with a simple, but heartfelt, “Yes, it is!”
