Coordinating conjunctions (and, or, but, either ... or, both ... and) combine two or more syntactic units of the same type, usually of the same syntactic category.
We can give a general rule schema: X -> X Conj X, where 'X' is any syntactic category.Example 1: conjunction of two clauses
___________S_____________ / \ / _____________S_____ / / | \ __AdvP_ __________S___________ Conj ___S____ /_______\ /______________________\ | /________\ Yesterday Kim took the bus to work and Pat walked.
Example 2: conjunction of two NPs
________NP___ / / \ \ Conj NP Conj NP | /__\ | /__\ Either Sandy or Chris will get the job.