A sentence is
- a grammatically independent unit that contains (1) a verb (AKA predicate) and (2) a subject
- wherein the verb is an action and the subject is a noun
- at least one word long yet typically composed of at least two words
- in one-word sentences either the subject (noun) or action (verb) is implied. Example: Go!
- started with a capital letter and then ended with end-mark punctuation–i.e., a period, exclamation, or question mark.