Which of these are central coordinators?
and
for
but
or
The difference between coordination and subordination is related to the syntactic level of the units being linked (Greenbaum and Quirk 1990). While in coordination the two units are on the same level on different levels( on the same level, on different levels ), in subordination they are on different levels on the same level( on different levels, on the same level )
There are two types of coordination: syndetic and asyndetic.
Some of the syntactic features of coordination are:
Clause coordination is sequentally fixed (clauses beginning in a coordinator cannot change places with the preceding clause)
Clause coordinators don't have a restricted position in the clause (they can occur initially or noninitially).
Coordinators can link clauses and clause constituents.
Coordinators cannot link more than two clauses.
Coordinators may be preceded by a conjuction.
Coordinators can link subordinate clauses.
The coordinator "and" may indicate a relation of sequence, contrast, concession, condition, similarity, addition or explanation between the two units.
The coordinator "or" is always used exclusively (i.e., to exclude the possibility of both units linked being true).
The coordinator "but" may be used to introduce a clause expressing the same as the first negative clause, but in positive terms.
The following correlative pairs can't link complete clauses:
"both...and"
"either...or"
"neither...nor"
While "either...or" emphasizes the exclusive meaning of "or", "both...and" may emphasize the additive or segregatory use of "and".
and can be used separately (without being a correlative pair) as negative adverbs if followed by subject-operator inversion.