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Noun Clause

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  • I don't know (how old is he).
    I don't know how old he is.
  • (What was he talking about) was interesting.
    What he was talking about was interesting.
  • I don't know (who opened the door?).
    I don't know who opened the door.
  • I don't remember (how many letters are there in the English alphabet?)
    I don't remember how many letters there are in the English alphabet.
  • (Where did she go?) is none of your business.
    Where she went is none of your business.
  • Do you know (when are they coming?)?
    Do you know when they are coming?
  • (Why did they leave the country?) is a secret.
    Why they left the country is a secret.