A conjunction may connect other parts of the sentence, as two word modifiers—A dark and rainy night follows; Some men sin deliberately and presumptuously.
It may connect two phrases; as, The equinox occurs in March and in
September.
It may connect two clauses, that is, expressions that, standing alone, would be sentences; as, The leaves of the pine fall in spring, but the leaves of the maple drop in autumn.
+Interjections+ (Lat. inter, between, and jacere, to throw) are the eighth and last part of speech.
Oh! ah! pooh! pshaw! etc., express bursts of feeling too sudden and violent for deliberate sentences.
_Hail! fudge! indeed! amen! _etc., express condensed thought as well as feeling.
Any part of speech may be wrenched from its construction with other words, and may lapse into an interjection; as, behold! shame! what!
Professor Sweet calls interjections sentence-words.
Two or more connected subjects having the same predicate form a +Compound
Subject+.
Two or more connected predicates having the same subject form a +Compound
Predicate+.