ex. The world's first skyscraper.
ex. Mars has ice caps it also has two moons.
makes a statement or states a fact, ends with a period
gives a command or makes a request, end with a period
when the subject of an imperative sentence is you, even if you doe not appear in the sentence
shows strong feeling or incitement
asks a question. end with a question mark
can stand alone
can NOT stand alone
main reason of the sentence
describes the subject
action of the sentence
describes the ajective