Prepositions: Time, Place and Relationships | English Grammar Chapter 09

Learning objectives

By the end of this lesson, you should be able to explain the main rules, identify the target forms in real sentences, avoid common errors and apply the rules to unfamiliar examples.

Understand the core terms and distinctions.
Study examples in context rather than memorising isolated rules.
Complete the practice before opening the answer key.

1. What is a preposition?

A preposition expresses a relationship between a noun phrase or pronoun and another part of the sentence. It often indicates time, place, movement, cause, means or an abstract connection.

The meeting is at noon. The keys are under the table. She travelled by train. We are interested in science.

A preposition usually has an object: in the room, after lunch, with them. A prepositional phrase can function as an adjective-like modifier or an adverbial.

2. At, on and in for time

Preposition	Typical use	Examples
at	Clock times and specific points	at 7:30, at noon, at night
on	Days and dates	on Friday, on 21 October, on my birthday
in	Months, years, seasons and longer periods	in October, in 2026, in winter, in the morning

These are common patterns, not universal laws. Expressions such as last Monday, next week, this year, every morning normally do not need a preposition.

3. At, on and in for place

At often marks a point or activity location: at the bus stop, at work. On often marks a surface or line: on the wall, on the coast. In often marks an enclosed area, region or space: in the room, in Bangladesh, in a car.

“At the school” can mean at that location; “in the school” stresses inside the building. “On the bus” is the usual expression for travelling as a passenger; “in the car” is usual for a car's interior.

4. Movement and other relationships

to: direction or destination — go to school.
into: movement from outside to inside — walk into the room.
onto: movement to a surface — climb onto the platform.
from: source or starting point — return from work.
through: movement within and out the other side — walk through the tunnel.
across: from one side to another — swim across the river.
for: duration, purpose or beneficiary — for two hours; a gift for you.
since: starting point in time — since Monday.
by: deadline, agent or means — by noon; written by her; travel by bus.

Do not confuse for and since: “for three years” describes duration; “since 2023” identifies the starting point.

5. Preposition patterns and common errors

Some words commonly pair with particular prepositions. Learn the whole phrase: interested in, good at, afraid of, depend on, listen to, belong to, responsible for, different from (also different to/in in some varieties).

Incorrect: discuss about the plan. Correct: discuss the plan.
Incorrect: married with someone. Standard: married to someone.
Incorrect: enter into the room (when simply meaning go inside). Usually: enter the room; “enter into” is used in other meanings, such as enter into an agreement.
Incorrect: since two hours. Correct: for two hours.

Prepositions at the end of a question or relative clause are natural in English: “Who are you talking to?” Formal alternatives are possible, but the end-position is not automatically an error.

Guided practice

Try each item first. Then open the answer key and read the explanation for any answer you missed.

Complete: The class starts ___ 9 a.m.
Complete: My birthday is ___ Friday.
Complete: She was born ___ 2010.
Complete: The picture is ___ the wall.
Complete: He has lived here ___ 2022.
Complete: We waited ___ two hours.
Choose: She is interested (in / on) history.
Choose: Please listen (to / at) the instructions.
Correct: “We discussed about the problem.”
Complete: They walked ___ the tunnel.
Choose: I usually travel (by / on) bus.
Complete: The cat jumped ___ the box (from outside to inside).
Choose: He is good (at / in) mathematics.
Correct: “She is married with a doctor.”
Does a preposition at the end of “Who are you talking to?” make it automatically wrong?

Show answer key and explanations

at — At is used for clock times.
on — On is used with days.
in — In is used with years.
on — On indicates attachment to a surface.
since — Since introduces the starting point.
for — For expresses duration.
in — Interested commonly takes in.
to — Listen takes the preposition to.
We discussed the problem. — Discuss takes a direct object without about.
through — Through describes movement within a passage and out the other side.
by — By bus is the standard means-of-transport expression.
into — Into expresses movement to the inside.
at — Good at is a common adjective–preposition pattern.
She is married to a doctor. — Married to is the standard pattern.
No. — Preposition stranding is natural and grammatical in English.

Revision checklist

I can explain the main rule in my own words.
I can identify the target form in a sentence.
I can explain why a common incorrect example is wrong.
I can apply the rule in a new sentence.

If an answer was wrong, identify the rule behind the mistake and practise that pattern again.

Continue learning

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Editorial note: Some grammar labels differ among textbooks. For a specific examination, follow the terminology and conventions in its syllabus.