If we want to ask a question in English, the order is QWASM: Question word, Auxiliary verb, Subject, Main verb. In Yes-No questions (questions where the answer is yes or no), there is no Question Word.
An indirect question can be more formal and polite than a direct question. This form uses an introductory question or phrase with the question you want to ask in sentence format after it. The difference is that the verb goes after the sentence as it would in a positive sentence.
Indirect Questions (Worksheet + Keys)
A tag question is a small question that is attached , or "tagged", to the end of a sentence. Rather than repeat the main verb, a form of "be" or other auxiliary verb or modal is used in the tag.