inate_ conjunctions are used to connect words, phrases, and clauses
of equal rank; _subordinate_ conjunctions connect clauses of unequal rank.

The principal cooerdinate conjunctions are _and, but, or, nor_, and _for_.
_And_ is said to be _copulative_ because it merely adds something to what
has just been said. Other conjunctions having a copulative use are _also,
besides, likewise, moreover_, and _too_; and the correlative conjunctions,
_both ... and, not only ... but also_, etc. These are termed _correlative_
because they occur together. _But_ is termed the _adversative_ cooerdinate
conjunction because it usually introduces something adverse to what has
already been said. Other words of an adversative nature are _yet, however,
nevertheless, only, notwithstanding_, and _still_. _Or_ is alternative in
its force. This conjunction implies that there is a choice to be made.

Other similar conjunctions are _either ... or, neither ... nor, or, else_.
_Either ... or_ and _neither ... nor_ are termed _correlative_
conjunctions, and they introduce alternatives. _For, because, such_, and
as are _cooerdinate_ conjunctions only in such a case as the following:
[She has been running, for she is out of breath].

Some of the most common conjunctions of the _subordinate_ type are those
of place and time, cause, condition, purpose, comparison, concession, and
result. _That_ introducing a subordinate clause may be called a
_substantive_ conjunction: [I knew _that_ I ought to go].

There are a number of subordinate conjunctions used in pairs which are
called _correlatives_. The principal pairs are _as ... so, as ... as, so
... as, if ... then, though ... yet_.

+80. Simple and Compound Sentences.+--In the first section of this review
the parts of a sentence were named as the _subject_ and _predicate_.

The _subject_ may itself consist of two parts joined by one of the
cooerdinating conjunctions: [Alice _and_ her cousin are here]. The
predicate may be formed in a similar fashion: [John played _and_ made
merry all day long]. Both subject and predicate may be so compounded:
[John _and_ Richard climbed the ladder _and_ jumped on the hay].

In all these cases the sentence, consisting as it does of but one subject
and one predicate, is said to be _simple_.

When two clauses--that is, two groups of words containing each a subject
and predicate--are united by a cooerdinate conjunction, the sentence is
said to be _compound_: [John wished