What Is a Preposition?
A preposition is a word that links a noun or pronoun to the rest of a sentence, showing place, time, or movement. Common examples: "on the table" (place), "at 9 a.m." (time), "through the door" (movement). CEFR exams test prepositions from A1 through C2.
Prepositions rank among the 10 most frequent word types in English, appearing in nearly every sentence you speak or write. Among the prepositions learners search for help with, in, on, and at together account for 47.6% of all specific-preposition mentions in Examinizer's own keyword research for this content series, more than every other preposition combined. That's why most CEFR tests drill these three words heavily before introducing harder ones like "beside" or "beneath."
Unlike verbs, prepositions rarely change form. There's no past tense of "in" or a plural of "at." That makes them simpler in one sense but harder in another, since learners have to memorize which preposition fits which context rather than apply a grammar rule. For a comparison of how form-changing words behave, see our guide on verb tenses.
Take our free CEFR-aligned grammar test to see where your preposition skills stand. A certificate costs €8 (incl. 21% EU VAT = €9.68) and arrives by email within 30 seconds of finishing the test. The test itself is a self-assessment tool, not a replacement for an accredited CEFR exam like the Cambridge or IELTS certifications.
In, On, At, To, For, With: A Comparison Table
The table below covers the six prepositions learners misuse most often, with the CEFR level at which each is typically introduced.
| Preposition | Main Use | Example Sentence | CEFR Level Introduced |
|---|---|---|---|
| in | place (enclosed spaces), time (months, years) | She works in London and started in 2024. | A1 |
| on | place (surfaces), time (days, dates) | The keys are on the table; the meeting is on Monday. | A1 |
| at | place (points), time (clock times) | Meet me at the station at 6pm. | A1 |
| to | movement, direction | We drove to the airport. | A1/A2 |
| for | duration, purpose | She studied for three hours. | A2 |
| with | accompaniment, tools | He fixed it with a screwdriver. | A2 |
In, on, at, and to appear as early as A1. For and with arrive later, once learners can handle more abstract relationships between ideas at A2. The order roughly tracks how often each word shows up in everyday speech versus formal or academic writing.
Prepositions rarely work in isolation. Articles and other small function words interact with them constantly, and mistakes in one often trigger mistakes in the other. See our breakdown of articles for the related patterns.
CEFR Level Breakdown: When Prepositions Are Taught (A1 to C2)
The Council of Europe built the CEFR framework to sequence grammar by difficulty. Prepositions follow six stages of increasing complexity, moving from concrete physical relationships to abstract and idiomatic ones that have no fixed rule.
A1 covers in, on, and at for basic place and time: in a city, on Monday, at 6pm. A2 adds to for movement and purpose, along with early exceptions learners tend to memorize by rote rather than derive from logic. B1 and B2 introduce with, by, and phrasal combinations that trip up intermediate speakers, such as depend on, agree with, and responsible for. By C2, learners are expected to handle context-sensitive, idiomatic usage where native intuition replaces any fixed rule.
This order isn't arbitrary. It reflects how often each preposition actually shows up in real English, which is also why in, on, and at dominate early instruction: they carry the heaviest practical load of any preposition group.
Check your current level with a free grammar test at /english-grammar-test/. It takes 25 minutes across 25 questions and pinpoints exactly where preposition gaps are affecting your score.
Common Mistakes with Prepositions
Three errors dominate learner writing. First, choosing the wrong time preposition, as in "on 5 o'clock" instead of "at 5 o'clock." Second, dropping the preposition after an adjective, saying "afraid" alone instead of "afraid of." Third, confusing "in time" (before a deadline) with "on time" (punctual, as scheduled).
One persistent myth needs correcting: ending a sentence with a preposition, as in "What are you waiting for?", is grammatically fine in modern English. The old objection came from Latin grammar rules applied incorrectly to English, and most style guides dropped it decades ago.
Preposition errors rarely show up alone. They cluster with mistakes in passive voice constructions and conditional sentences, where shifting word order makes prepositions easy to misplace or drop entirely. See passive voice rules and conditional structures for the related patterns.
A free test at Examinizer checks all three error types directly and delivers a CEFR-aligned result by email in 30 seconds.
In, On, and At: Rules for Place and Time
Three words cause more confusion than any others: at marks a point, on marks a surface or specific day, and in marks an enclosed space or longer stretch of time. Together they account for 47.6% of all specific-preposition mentions collected in Examinizer's own keyword research, the largest share of any preposition group by a wide margin.
For place: at for a precise point ("at the bus stop"), on for a surface ("on the table"), in for something enclosed ("in the box"). For time, the same logic carries over: at for a clock time ("at 6pm"), on for a specific day ("on Friday"), in for a longer period ("in November"). Thinking of it as point versus surface versus container makes the pattern easier to retain.
Textbooks introduce all three at A1 because they're essential for basic sentences about routines and locations. By A2 and B1, learners are expected to use them automatically in fixed expressions like "at home," "on holiday," and "in time." Mistakes with these phrases at B1 or above usually signal a gap worth checking directly.
The confusion rarely comes from a single source. English pairs "in the morning" with "at night," and American English uses "on the weekend" where British English uses "at the weekend." Translation habits compound the problem: Spanish speakers often default to "en" for every context, German speakers carry over "um" for time expressions, and both end up misapplying rules that don't map cleanly across languages.
Modal verbs like can, must, and should follow their own confusing patterns, unrelated to prepositions but just as common a source of errors. That topic is covered separately at /grammar/modal-verbs/.
Take the free preposition test at /grammar/ to find your specific weak points, then take the full CEFR-aligned exam for an official result. Neither test replaces an accredited certification exam, but both give a reliable estimate of your current level.