Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993.
CONJUNCTION
This part of speech is actually two groups of function words, each with a different grammatical function: coordinating conjunctions and subordinating conjunctions. Coordinating conjunctions connect two equal grammatical structures, as in I wanted a bath, and I needed food; man and wife; and weary but happy. Subordinating conjunctions connect dependent clauses to or include them in independent clauses: I’ve had no sleep since they arrived. Until she spoke, we didn’t recognize her. We were unaware that she had left. See COORDINATING CONJUNCTIONS; SUBORDINATING CONJUNCTIONS.
