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Subordinate Clauses as Objects of Prepositions
Ex # 2 based on Black Beauty, by Anna Sewell
Analysis Key

In these sentences "what" functions simultaneously as the subordinating conjunction and either the subject or the complement within its clause. Students who have not yet studied subordinate clauses will often consider just the "what" as the object of the preposition. 

1. He must never start {at [OP what (DO) he sees] }, nor speak {to other horses},

nor bite, nor kick, nor have any will (DO) {of his own}. |

2. She had a good idea (DO) {of [OP what was coming] }. |

3. I am never afraid (PA) {of [OP what (DO)  I know] }. |

4. It won't stand [Adv. to "not" when things come to be turned (P) inside out 

and put down (P) {for [OP what (PN) they are] }. |

"Come to be" means "become," and "put down" means "recorded."
5. The sides {of the box} were not so high (PA) {but [OP that I could see 

all (DO) [Adj. to "all" that went on] {through the iron rails} [Adj. to "rails" that 

were {at the top} ]] }. |

The "but" phrase chunks as an adverb to "so." Without the "but" the "that" clause would need a "not" (that I could not see...) and would be adverbial to the "so." "Went on" is a phrasal verb that means "happened."
6. So she went on {till [OP after he was buried (P) ] }. |
In this sentence, "went on" means "continued." It is unusual to see a clause that begins with "after" and functions as a noun.
7. The children had many consultations (DO) together {about [OP what (DO)

father and mother would do] }, and {*about* [OP  how they could help 

to earn money] }. |

"Money" is the direct object of the verbal (infinitive) "to earn." The infinitive phrase functions as the direct object of "could help." (The subject of the infinitive and indirect object of "could help" is an ellipsed "them."