'I know you.' Choose the complex form.

Correct Answer: (B) I know who you are. Transformation of sentences from simple to complex form is a key grammatical skill tested in NTRCA exams. Analysis: Simple sentence: "I know you." Complex sentence: A complex sentence contains one principal clause and at least one subordinate clause. Why (B) is correct: — "I know who you are" has a principal clause "I know" and a subordinate noun clause "who you are" — The embedded question (indirect/embedded question) follows subject-verb order: "who you are" NOT "who are you" — This is a noun clause acting as the object of 'know' Why (C) and (D) are wrong: ✗ "I know what are you" / "I know who are you": In embedded/indirect questions, we do NOT invert subject and verb. We keep normal statement order. — Direct question: "Who are you?" → Embedded: "who you are" ✓ Rule to Remember: In embedded/indirect questions: Question word + Subject + Verb (normal order — NO inversion) "I know + who + you + are" ✓ Source: Advanced English Grammar — R. Murphy; NTRCA Question Bank.