Prepositions show relationships between words in space, time, or connection. Spatial prepositions include "in" (inside an area), "on" (surface contact), "at" (a precise point or location), and "by" (proximity or means). "In" also refers to time within a period ("in July"), while "at" can refer to precise times ("at noon"). The more formal "upon" is a synonym of "on," and "between" expresses position in the space separating two items.
Movement and direction are expressed through prepositions such as "to" (toward a destination), "into" (movement toward the inside), "through" (from one side to the other), "over" (above or across), and "out" (outward movement or exposure). "From" indicates the origin or starting point: "I am from Canada." Prepositions also link ideas abstractly: "of" expresses relationship or possession ("the leg of the table"), "with" indicates accompaniment, instrument, or possession ("come with me," "cut with a knife," "the man with red hair"), and "about" means "concerning" or "approximately."
Time and comparison prepositions include "before" and "after" (earlier or later in time or order), "like" (similar to, as a preposition), "as" (role, manner, or comparison), and "than" (used in comparisons, as in "taller than me"). "Like" can also function as a verb meaning "to enjoy." "Up" is technically an adverb but functions as a preposition in phrases like "up the stairs," and "out" similarly suggests "out of" in everyday speech. Many prepositions have multiple meanings depending on context, making them among the most flexible and frequently used words in English.