If you're a fan of both endlessly quoting movies—from Terminator's "I'll be back!" to Independence Day's "Welcome to Earth!"—and grammar, you'll enjoy these diagrams, breaking down the clauses of some of our favorite movie lines.
There are lots of animals, including dogs and apes, that can communicate in something we might understand as sentences. But only one non-human species has complex enough communication that they actually need grammatical rules. Say hello to the Bengal finch.
Syntax is found in all languages: verbs, subjects, and objects are arranged in predictable patterns that allow us to comprehend the action being described. And syntax goes deeper than language, as it's actually hardwired into our understanding of the world.
While other primates have exhibited simple vocabularies, it has long been believed that syntax, the construction of sentences, was unique to humans. But a recent study suggests that at least one species of monkey communicates in vocalized sentences.