Final answer:
A noun clause can function as a predicate noun following a linking verb, like 'The fact is that she loves to dance'. It can also serve as the object of a preposition, as in 'I am grateful for what you did for me'.
Step-by-step explanation:
For a noun clause to serve as a predicate noun, it means that the noun clause will function as a subject complement, following a linking verb. An example is: The fact is that she loves to dance. Here, 'that she loves to dance' is the noun clause serving as the predicate noun.
For the second task of using a noun clause as the object of a preposition, an example could be: I am grateful for what you did for me. In this case, 'what you did for me' is a noun clause serving as the object of the preposition 'for'.
Learn more about Noun Clauses