In, On & At

In, on and at are three of the most common words in English, and choosing the wrong one is an instant giveaway. Start with three pictures, then learn the patterns that don't follow them.

The basic idea

• In = inside or within something: in the house, in the car, in June.
• On = on a surface, supported by or connected to something: on the table, on the bus, on Monday.
• At = a specific point or location: at the airport, at 6 p.m., at the corner.

Place

• In for inside a space: I'm in the office (inside the building).
• On for surfaces, floors, streets and coasts: The office is on the third floor.
• At for a general location or point: I'm still at the office (that's where I am).
• Transportation: on what you board or ride on top of (on a plane, on the bus, on a bike, on a horse); in a small enclosed vehicle (in a car, in a taxi, in a canoe). A boat can take either: on a ship, in a small boat.

Time

• In for months, years, parts of the day and periods: in 2018, in the morning, in two weeks.
• On for days and dates: on Monday, on May 6, on Tuesday afternoon.
• At for exact times and points in time: at 6 p.m., at the end of the week, at that point.

Learn these as patterns

• In: in trouble, in danger, in debt, in reality, in the middle of, in a circle.
• On: on vacation, on time, on track, on the way, on leave, on a project.
• At: at this rate, at age 65, at 30 percent, at the start / at the end; look at, point at, aim at.

How they sound

In a sentence, these little words are unstressed: at shrinks to "ut" (at the airport → "ut the airport"), and before a vowel its T flaps and links on (at all → "uh-dall"); on and in stay short and glide into the next word. Stress the noun, not the preposition: I'm on my way sounds like "I'm on my WAY".

💡 Describe where you are right now: use at for the place, then in or on for the detail: "I'm at home, in the kitchen, on a stool."