Is it the definite article?
So, to reiterate, when it comes to when to use the “the”, the only universal rule is this:
Some rules (such as the two you’ve given) might hold 95%+ of the time, but unfortunately there may be weird and arbitrary exceptions that you’ll just have to learn.
Is it capitalization?
Because a cursory look at the Wikipedia page for capitalization also reveals that it is not without its quirks.
For example:
planets and other celestial bodies: “Jupiter”, “the Crab Nebula”; and “the Earth”, “the Sun”, or “the Moon” should be capitalized according to the International Astronomical Union based on its manual of style, but style guides may suggest differently.[19]
Source: https://en.wikipedia.org/wiki/Capitalization_in_English
Is it the fact the way something is written almost has no bearing on how it’s pronounced?
Please tell me your thoughts.


Per formal linguistics, it’s “respectively”.
Like: Bob, Alicia, and Siobhan are a teacher, plumber, and electrician, respectively.
We know this means Bob is a teacher and Siobhan is an electrician, but trying to write rules for how English works that account for this usage is thorny.
Let me try writing a rule for it.
“Given two lists, the word “respectively” indicates the n-th item in each list corresponds to the n-th item in the other list.”
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It’s not that it’s hard to write a rule for “respectively”. It’s that it needs its own rule, specifically. The general rules don’t cover it.
German has this too, “beziehungsweise”, but it replaces the “and” instead of being added to it. It is common enough that it’s usually abbreviated “bzw.”.
I don’t understand what the issue is/could be. “Respectively” is clearly functioning syntactically as an adverb, and the sentence “Bob, Alicia, and Siobhan are a teacher, plumber, and electrician” without the “respectively” is a valid sentence where its two noun phrases happen to be conjunctions of other nouns.
A sentence like “Bob, Alicia, and Siobhan are a teacher, plumber, electrician, and astronaut, respectively” is equally valid syntactically, it’s just invalid semantically.