I'm supposed to choose how the italicized noun clause is used. Not so sure about the different types of noun clauses.. can someone help me? & also kinda explain the difference?

Question

1. The chairman heard [what was said about the program.]
S
OP
PN
DO

2. A good night's sleep is [what I need most.]

S
OP
PN
or DO?

3.[What I had been hoping for] was a scholarship.
S <--- i think this 1 would be subject?
OP
PN
DO

4.Our charitable contributions should go to [whatever groups seem most worthy.]
S
OP
PN
DO

5.A lecture on cleanliness was not [what the children wanted to hear.]
S
OP
PN
DO

6.[That you overslept] is a serious matter.
S
OP
PN
DO

7. Have you discovered [where you left your books?]
S
OP
PN
DO

Please help me! thanks :)

Answer 1

Think about WHERE each clause is placed in relation to the verb of the sentence.

BEFORE the verb? It's probably a subject.
#3 -- yes, it's the subject.

AFTER the verb? It's probably a direct object (if the verb is an action verb) or a predicate nominative (if the verb is a linking verb).
#2 = ??

English depends a great deal on WORD ORDER (the order of the words in a sentence) for meaning.

Answer 2

s
s
s
s
s
s
s