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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.
Oops!
Okay!
(What was he talking about) was interesting.
What he was talking about was interesting.
Oops!
Okay!
I don't know (who opened the door?).
I don't know who opened the door.
Oops!
Okay!
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.
Oops!
Okay!
(Where did she go?) is none of your business.
Where she went is none of your business.
Oops!
Okay!
Do you know (when are they coming?)?
Do you know when they are coming?
Oops!
Okay!
(Why did they leave the country?) is a secret.
Why they left the country is a secret.
Oops!
Okay!
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