1. Coordination as a non-headed construction In a coordination, two or more elements of equal status are joined to make a larger unit. Special words called coordinators are used to mark this kind of joining. Jane is a good teacher and her students really like her. The joined elements that are underlined are called coordinates. The most common coordinators are and, but, so

2. Internal syntax:
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The coordinator is not one of the coordinates; it forms a constituent with the coordinate following it.
Ex: Jane is a good teacher and her students really like her.
The 1st constituent is the clause Jane is a good teacher (bare coordinate). The 2nd constituent is and her students really like her which is marked by the coordinator and (expanded coordinate).

3. Distinctive syntactic properties of coordination
Prototypical coordination has three properties which we summarize below and then explain in the following subsections
The grammar sets no limit on how many coordinates a coordination can have.
The bare coordinates are required to be syntactically similar in certain ways
An expanded coordinate can never be proposed.

4. 2.1 Unlimited number of coordinates A coordinate construction can have any number of coordinates from two up.

5. 2.2 Bare coordinates must be syntactically similar We invited the Smiths and because they can speak Italian. She argued persuasively or that their offer should be rejected.

6. Function rather than category is the crucial category
In a large majority of the coordinate structures found in texts , the coordinates belong to the same CATEGORY. But coordinates do not have to be of the same category.
He won’t reveal the nature of the threat or where it came from. (NP + clause)
I’ll be back next week or at the end of the month. (NP+PP)

7. Function is more important than category in determining the permissibility of coordination. What makes the coordination acceptable despite the differences of category is that each coordinate could occur alone with the same function.
Complements
Time adjuncts
He wont reveal the nature of the threat.
He wont reveal where it came from.
I’ll be back next week.
I’ll be back at the end of the month.

8. We’re leaving Rome and next week
We’re leaving Rome and next week. (NP+NP) Object + Time adjunct Since the functions are different, then it is inadmissible

9. Relativisation across the board They attended the dinner but they are not members. In the above example we have a subordination of main clauses. If we embed this to make it modify a NP structure, we have to relativise BOTH elements. The people who attended the dinner but who are not members owe $20. *The people who attended the dinner but they are not members owe $20.

10. Relativisation is said to work across the board, i
Relativisation is said to work across the board, i.e it applies to all coordinates.

11. 2.3 Impossibility of preposing an expanded coordinate It is impossible to prepose an expanded coordinate. But they are not members, they attended the dinner.

12. The order of coordinates The order of coordinates can be changed without having an effect on the acceptability or interpretation of the coordination. Coordination of this kind is called symmetric.
We can have beans or broccoli.
We can have broccoli or beans.
I was hungry and tired.
I was tired and hungry.

13. We were left high and dry. We were left dry and high.
I got up and had breakfast.
I had breakfast and got up.
High and dry is a fossilized expression, so that the order is fixed (black and white, hustle and bustle).
In the 2nd example, both sentences are acceptable (grammatical) but there is a difference in meaning.
When the change in coordinates affects the acceptability or the interpretation of the clause then its asymmetric.

14. He parked his car at a bus stop and was fined $100.
There’s an implication that he parked his car before getting fined. There’s also a further implication that the fining is a consequence of parking the car at a bus stop.
Pay within the week and you’ll get a discount.
There’s a conditional implication: “If you pay within a week, you get the discount.”
We need to pay the bill today or we won’t get a discount.
There’s a conditional implication but with or the implicit condition is negative: If we DON’T pay the bill today, we won’t get the discount.

15. The marking of coordination
In all of the examples so far the coordination has been marked by a coordinator introducing the final coordinate. This is the most common patter, but not the only one. There are 3 other possibilities.
Unmarked coordination
Sometimes no coordination is used, so the coordination is just a list. Commas are used to separate the items in writing.
He felt (tired, depressed, listless.) (and understood)
Did they ever offer you (coffee, tea, juice?) (or understood.

16. B ) Repetition of coordinator
The repetition of coordinator gives added emphasis to the relation it expresses
He felt (tired, and depressed, and listless).
They offered us a choice of (coffee or tea or juice).
C ) Correlative coordination
Although the 1st coordinate is never introduced by a coordinator, it can be marked by one of the determinatives both, either, and neither, paired respectively with the coordinators and, or, and nor, which makes this type correlative coordination
(Both of the managing director and the company secretary) have been arrested.
Its one of those movies that you’ll (either love or hate.)
(Neither Sue nor her husband) supported the plan.

17. Layered coordination
[ [Kim works in a bank and Pat is a teacher], but [Sam is still unemployed] ].
The larger coordination has the form X but Y; the Y is just a clause, Sam is still unemployed, but the X is a coordination of the two underlined clauses.
At the top level we contrast employed with unemployed; at the lower level we distinguish two jobs.

18. You can have [[pancakes] or [egg and bacon]]
You can have [[pancakes] or [egg and bacon]]. We have X or Y expressing a choice, where X is an NP and Y is a coordination. [[Laurel and Hardy] and [Fred and Ginger]] are my favorite movie duos. We have X and Y at the top level, and at the lower level each of X and Y has the form of coordination.
Notes in book

19. Main clause and lower level coordination See book