This chapter explores the structure and function of questions and embedded clauses in English. It begins by detailing question tags, emphasizing their role in conversational engagement and verification, alongside the crucial interplay of tense and negation. The discussion then moves to interrogative sentences, explaining how tense and agreement markers contribute to their formation. The chapter further elaborates on complex sentences, focusing on how entire clauses can be embedded as objects and how questions behave within these structures. Finally, it examines the use and distinctions of ‘whether’ and ‘if’ clauses as complementizers for indirect questions and discusses the nature of ‘that-clauses’ and various subject types in English sentences.