Student or Learner
How can one explain the grammar of this sentence? Is it true to say that 'who you are' is the object, or is it something different?
I look forward to receiving some replies.
This sentence contains an embedded question (with the usual reversed word order), which functions as the direct object of 'will know':
How will I know who you are?
How will I know something?
who = you = conjunctive connective pronoun; it introduces a nominal clause, as you can see from the parallel sentences.
I will know something how?
I will know something thus.
how = an adverbial question word
How will I know? (question-1, following question order)
Who are you? (question-2)
The second question is joined with the first, as a noun clause to act as the object of the verb ‘know’, by means of the connecting conjunction ‘who’ which is a relative pronoun. After merger, the noun clause follows the normal statement order, , as:
How will I know who are you? (Incorrect)
How will I know who you are? (correct, statement order)