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(Code and Color Key)

Clauses as Delayed Subjects
based on
Twenty Thousand Leagues Under the Seas by Jules Verne
Analysis Key

1. And, {in these disastrous times}, [ [#1] when the ingenuity {of man} has 

     multiplied the power (DO) {of weapons} {of war}], it was possible

     (PA) [Del Subj. that, {without the knowledge} {of others}, a state might

     try to work such a formidable engine [#2] ]. |

2. "Well [Inj], Ned [DirA]," [ [#3] said I,] "is it possible (PA) [Del Subj.

     that you are not convinced (P) {of the existence} {of this cetacean} 

     [Adj. to "cetacean" that we are following]]?" |

3. It is certain (PA) [Del Subj. that I soon came to, thanks [#4] {to the 

      vigorous rubbings} [Adj. to "rubbings" that I received]]. |

4. It is my opinion (PN) [Del Subj. that we shall never again see the like (DO)]. |

5. It was plain (PA) to see [#5] [Del Subj. that this Mediterranean

     inclosed [#6] {in the midst} {of those countries} [Adj. to "countries" which he 

     wished to avoid [#7] ], was distasteful (PA) {to Captain Nemo}]. |


Notes
1. This "when" clause can be viewed as adjectival to "times' and/or adverbial to "was."
2. "Engine" is the direct object of the verbal (infinitive) "to work." The infinitive phrase functions as the direct object of "might try."
3. KISS explains this clause as an interjection. See KISS Level 3.2.3 - Interjection? Or Direct Object?
4. I would explain "thanks" as a noun used as an adverb, but I'm fairly certain that some grammarians would have other explanations.
5. The verbal (infinitive) "to see" functions as an adverb to "plain."
6. "Inclosed" (so spelled in the original)  is a verbal (gerundive) that modifies "Mediterranean."
7. The verbal (infinitive) "to avoid" functions as the direct object of "wished."