361. Conjunctions connect words or groups of words.
Conjunctions are either coördinate or subordinate.41
1. A coördinate conjunction connects words or groups of words that are independent of each other.
In each of the first four sentences, the conjunction (and, or, but) connects single words that are in the same construction (subjects, objects, predicate adjectives, adverbs). In the fifth, but connects an adverb with an adverbial phrase (both being modifiers of the verb embarked). In the sixth, and joins the two coördinate clauses of a compound sentence (§ 44). In the seventh, and joins two coördinate clauses which, taken together, make up the subordinate clause until ... deserted; this clause may therefore be called a compound subordinate clause (see § 454).
2. A subordinate conjunction connects a subordinate clause with the clause on which it depends.
362. The chief coördinate conjunctions are:—
Several of these are much used for transition, whether from sentence to sentence or from one paragraph to another.
363. Then is an adverb when it denotes time, a conjunction when it denotes consequence or the like.
364. Yet and still are adverbs when they express time or degree, conjunctions when they connect.
365. For and notwithstanding may be either prepositions or conjunctions.
| Prepositions | Conjunctions |
|---|---|
| I am waiting for you. | We must go, for it is late. |
| Jane is coming, notwithstanding the storm. | It is a hard storm. She will come, notwithstanding. |
Note. For is sometimes classified as a subordinate conjunction, but the fact that it may be used to begin an independent sentence (even when such a sentence opens a paragraph) justifies its inclusion among the coördinates.
366. The chief subordinate conjunctions are:—
A few phrases may be regarded as compound conjunctions. Such are:—in order that, so that, provided that, in case that, but that, as if, as though, even if. Provided, and in case (without that) may also be used as conjunctions: as,—“I will go provided it doesn’t rain.”
367. The subordinate conjunction that is often omitted when it may readily be supplied.
Note. This omission is similar to that of the relative pronoun (§ 151). It is extremely common, not only in colloquial language but also in literature, whether prose or verse.
368. As and since in the sense of “because,” and while in the sense of “though,” are conjunctions.
When denoting time, as is an adverb, while is a noun or an adverb, and since is an adverb or a preposition.
369. Conjunctions used in pairs are called correlative conjunctions.
The chief correlatives are:—
Examples of correlatives may be seen in the following sentences:—
370. But is used as a subordinate conjunction in the sense of but that or unless.
Note. In the last two examples the subject of the subordinate clause is omitted:—“There is not a wave but [it] is associated,” “There was nobody but [he] loved her.” In such cases, but is sometimes regarded as a relative pronoun.
Notwithstanding is used as a subordinate conjunction in the sense of though.
I shall go, notwithstanding the road is said to be impassable.
371. Relative adverbs are similar in their use to conjunctions, and are therefore often called conjunctive adverbs (§§ 194–195).
Note. Most conjunctions, historically considered, are merely adverbs (or adverbial phrases) which have come to be used in so peculiar a way as to form a special class among the parts of speech. Thus the adverbs since and while become conjunctions when they cease to denote time; because is a corruption of the phrase by cause; but is developed from an old adverb meaning “outside.”