What is the difference between in time and on time?

On time means "punctual, at the scheduled time" (The meeting started on time). In time means "early enough, before it is too late" (We arrived in time for the presentation).

When do you use at, in, and on for time?

At for specific times and certain moments (at 9 a.m., at night). In for longer periods (in January, in 2024, in the morning). On for days and dates (on Monday, on March 5th).

When do you use at, in, and on for place?

At for a specific point (at the office, at the airport). In for an enclosed space or area (in the room, in Paris). On for a surface (on the table, on the second floor).

Are prepositions common on the TOEIC®?

Yes, very common. They appear in Part 5 (preposition choice), Part 6, and in Part 7 texts. Fixed expressions with prepositions are especially tested.

What is the difference between at the end and in the end?

At the end (of) means "at the final point of something" (at the end of the meeting). In the end means "finally, after everything" (In the end, we decided to cancel).

IN, ON, AT: Prepositions of Time and Place (Pyramid)

IN, ON, AT in English: the three prepositions learners confuse most

In, on, and at are three of the most common words in English, and the three that learners mix up most often. The good news is that one simple idea covers both time and place: use IN for large or enclosed things, ON for a surface or a line, and AT for a single exact point. This holds whether you are talking about a year, a street, a clock time, or an address. On the TOEIC®, in, on, and at appear in almost every section and are a frequent source of errors.

The IN, ON, AT pyramid

The easiest way to remember in, on, at is the preposition pyramid: the preposition narrows as the thing it points to gets more specific. IN sits at the top for the biggest, most general containers, ON sits in the middle for surfaces and lines, and AT sits at the bottom for a single point. The same pyramid works for both time and place.

Time pyramid

IN: years, months, seasons (in 2024, in May, in summer)

ON: days, dates (on Monday, on May 5th)

AT: clock times (at 9 a.m., at noon)

Place pyramid

IN: countries, cities, enclosed areas (in Japan, in a room)

ON: surfaces, streets, floors (on the wall, on Main Street)

AT: exact points, addresses (at the door, at 10 Main St.)

Read each pyramid from top to bottom and the choice between in, on, at becomes a question of size: the smaller and more precise the thing, the lower you go.

IN, ON, AT for time

Here is how in, on, at work for time. Use the time pyramid above as your guide: in for long periods, on for days and dates, at for exact clock times.

Preposition	Usage	Examples
at	specific times, moments	at 3 p.m., at noon, at night, at the weekend
in	months, years, seasons, periods	in January, in 2024, in the morning, in summer
on	days, dates	on Monday, on March 5th, on Christmas Day, on my birthday

IN, ON, AT for place

For place and location, in, on, at follow the same pyramid: in for enclosed spaces and areas, on for surfaces and lines, at for a single exact point.

Preposition	Usage	Examples
at	specific point, location	at home, at the office, at the airport, at the bus stop
in	enclosed space, area, city, country	in a room, in Paris, in a car, in the building
on	surface, floor, public transport	on the table, on the wall, on the bus, on the second floor

Quick comparison: when to use in, on, at

When you are unsure which one to pick, use this one-line decision rule.

Use	when the thing is...
in	inside or enclosed, or a large area (a box, a room, a city, a year)
on	on a surface or a line (a table, a wall, a street, a day)
at	a single exact point (an address, a door, a clock time)

Common Fixed Expressions

Expression	Meaning
in advance	beforehand
in charge of	responsible for
in addition to	besides, as well as
at least	not less than
at risk	in danger
on behalf of	representing, for
on time	punctual, at the scheduled time
in time	early enough
on purpose	intentionally
in progress	underway, ongoing

Prepositions After Adjectives

Adjective + Preposition	Example
responsible for	She is responsible for the project.
interested in	He is interested in marketing.
good at	She is good at negotiating.
different from	This model is different from the previous one.
similar to	Our approach is similar to theirs.
aware of	Are you aware of the changes?

Prepositions After Verbs

Verb + Preposition	Example
depend on	Success depends on teamwork.
apply for	She applied for the position.
belong to	This laptop belongs to the company.
agree with	I agree with your proposal.
comply with	All employees must comply with the policy.
result in	The delay resulted in extra costs.

These are fixed collocations: the preposition does not change the verb's meaning. That is different from phrasal verbs (verb + particle), where the particle creates a new meaning (call off = cancel).

On time vs in time, and other common traps

Prepositions are a recurring grammar point in TOEIC Part 5. Here are the most common traps.

On time vs in time: on time = punctual, in time = early enough. Do not confuse them
At the end vs in the end: at the end of = at the final point of something, in the end = finally
In the morning/afternoon but at night: an important exception to remember for the TOEIC®
In a car but on a bus/train/plane: use in for small vehicles and on for large public transport
Fixed expressions: adjective/verb + preposition combinations are fixed. Interested in (never *interested at)

Preparation Tips

Memorize fixed expressions: they are tested as-is on the TOEIC®
Learn adjective + preposition combinations: this is a classic Part 5 trap
Practice with full sentences: context helps you choose the right preposition. Try our free TOEIC practice exercises to train
Train on Part 5: prepositions are very frequently tested there

Find all our tips in our TOEIC preparation guide.

Frequently Asked Questions

Master Prepositions with 990prep

The prepositions in, at, on are among the most common errors on the TOEIC®. Practice with 990prep exercises to use them correctly in every context.

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