A subordinate clause in a complex sentence forming one of the following elements:
 Subject:
What they want to do next is to use deuterium and tritium in the machine.
 Object:
We don’t just let them do what they want to do.
 Subject Complement:
This what they want to do.
 Object Complement:
He made it what it is today.
A noun clause can also be the object of a Preposition:
Women make their own minds up about what they want to do.
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