Prepositions Questions for CDS

What is a Preposition?

A preposition is a linking word placed before a noun or pronoun to show its relationship with another word in the sentence. That relationship can be of place, time, direction, manner, cause, or possession. The noun or pronoun following a preposition is called its object, and it always takes the objective case — so it is always 'between you and me', never 'between you and I'.

• Prepositions always have an object — a noun, pronoun, or noun-phrase following them.
• Pronoun objects must be in objective case: me, him, her, us, them — not I, he, she, we, they.
• Common categories: place (in, on, at, under), time (at, on, in, since, for), direction (to, towards, into, onto), cause (because of, due to), manner (by, with).
• A preposition placed at the end of a sentence is grammatically acceptable in modern English — do not mark it as an error in CDS.
• Compound prepositions act as single units: in front of, in spite of, on behalf of, by means of.

At, On, In — Time Usage

This trio causes the most errors. Think of them as zoom levels on a camera: At is the sharpest zoom — a precise point in time. On is medium zoom — a specific day or date. In is the widest zoom — a long period like a month, year, season, or era. This zoom analogy alone covers 80 percent of time-preposition questions.

• AT: precise times and fixed expressions — at 5 o'clock, at noon, at midnight, at dawn, at present, at the moment, at Christmas (the festival day itself).
• ON: days and dates — on Monday, on 15 August, on Independence Day, on a cold morning.
• IN: longer periods — in January, in 2024, in the 18th century, in summer, in the morning (general habit, not a specific morning).
• Exceptions to memorise: at night (not in night), in the night (meaning during a particular night), at the weekend (British), on the weekend (American).
• No preposition before: last, next, this, every — say 'I will come next Monday', not 'on next Monday'.

At, On, In — Place Usage

The same trio applies to place, again using the zoom analogy. At marks a point or location as a meeting spot. On marks a surface or a line such as a road or floor. In marks an enclosed or bounded space. The key is to think whether you are inside something (in), on a surface (on), or simply at a spot (at).

• AT: a point or address treated as a dot — at the bus stop, at the corner, at the airport, at 12 Baker Street.
• ON: surface or line — on the table, on the wall, on the floor, on the road, on the first floor (British English).
• IN: enclosed space — in the room, in the box, in Delhi (city), in India (country), in the car (enclosed vehicle).
• Vehicles: in a car/taxi (enclosed), on a bus/train/plane/ship (you can walk around).
• At vs In for places: at school means the activity; in school means physically inside the building. Similar: at home vs in the house.

Since vs For

Both are used with perfect tenses to talk about duration, but they mark different things. Since points to a starting point — a moment in the past. For measures the total span of time. Confusing these two is the single most common Spotting Errors trap in CDS.

• SINCE: starting point — since 2010, since Monday, since childhood, since he left.
• FOR: duration/span — for two years, for three hours, for a long time, for ages.
• Always use perfect tense (have/has/had) with since — 'I have lived here since 2010' is correct; 'I lived here since 2010' is wrong.
• FOR can be used with simple past — 'I lived there for two years' is perfectly correct.
• Quick test: if you can replace the word with a number + time unit, use for. If you can replace it with a specific moment, use since.

Between vs Among

Between is used when two distinct entities are involved. Among is used when three or more entities form an undifferentiated group. However, between can also be used for more than two when each entity is considered individually and distinctly — for example, a treaty between five countries treats each country as a separate party.

• Between: two entities or individually distinct items — between Ram and Shyam, between the two chairs.
• Among: three or more as a group — distribute among the students, popular among the masses.
• Do not use amongst in formal writing or exams unless quoting — among is the preferred form.
• Between you and me (NOT between you and I) — pronoun after preposition must be objective case.

Common Verb + Preposition Collocations

Many verbs are locked to specific prepositions by convention — there is no logical rule, only usage. CDS tests these through Fill in the Blanks and Sentence Improvement. Memorise these pairs as chunks, not individual words.

• Agree WITH a person, agree TO a proposal, agree ON a plan.
• Differ FROM (be different), differ WITH (disagree with a person).
• Compare TO (point out similarity), compare WITH (examine both similarities and differences).
• Accused OF, convicted OF, guilty OF — all three take OF.
• Depend ON, rely ON, insist ON, concentrate ON.
• Angry WITH a person, angry AT a thing or situation.
• Married TO (not married with), engaged TO, devoted TO, addicted TO.

Adjective + Preposition Collocations

Adjectives also lock onto specific prepositions. These are tested in Spotting Errors — the sentence looks correct but the preposition is swapped.

• Afraid OF, tired OF, proud OF, ashamed OF, fond OF, aware OF, capable OF.
• Interested IN, engaged IN, absorbed IN, involved IN.
• Good AT, bad AT, clever AT, skilled AT.
• Different FROM (not different than or different to in formal Indian English exams).
• Similar TO, identical TO, equivalent TO.
• Satisfied WITH, pleased WITH, disappointed WITH/AT.

• Writing 'on next Monday' or 'on last Tuesday' — never use a preposition before last, next, this, every.
• Using 'since two years' instead of 'for two years' — since needs a starting point, not a duration.
• Writing 'between you and I' — after a preposition the pronoun must be objective: between you and me.
• Using 'different than' instead of 'different from' — in CDS standard English, different from is the correct collocation.
• Confusing 'angry with' and 'angry at' — use angry with for a person, angry at for a situation or thing.
• Treating 'in the night' and 'at night' as interchangeable — at night means generally/habitually, in the night means during a specific night.

• ZOOM LENS for time and place: AT = sharp zoom (point), ON = medium zoom (surface/day), IN = wide zoom (period/enclosed space).
• SINCE = Specific Instant (S-I), FOR = Full Range — if it is a specific moment use since, if it is a full range/duration use for.
• OFA club for guilty feelings: Accused OF, Convicted OF, Guilty OF, Ashamed OF, Afraid OF, Fond OF — they all take OF.
• AT person, AT situation flip for anger: Angry WITH the person who wronged you (with = personal), Angry AT the traffic jam (at = impersonal thing).

• In the Spotting Errors section, whenever you see a preposition, immediately check three things in order: is it the right preposition for the verb or adjective collocation, is the pronoun after it in objective case, and is there an unnecessary preposition before last or next.
• Fill in the Blanks questions on prepositions almost always come from the six high-frequency pairs: since vs for, in vs at vs on (time), between vs among, to vs with (married/compared), from vs with (different/satisfied), and on vs about (comment/remark).
• Sentence Improvement questions love swapping 'from' with 'than' in 'different from' constructions — the original sentence will say 'different than' and the correct option will say 'different from'.
• Do not spend more than 30 seconds on a preposition question. If you have memorised collocations, it should be instant recall. If you are unsure, eliminate options with pronouns in subjective case after the preposition — that narrows it down fast.
• CDS 2022 and 2023 papers both had questions on verb-preposition collocations (agree to vs agree with, compare to vs compare with) — these are reliable repeat topics, review the collocations section the night before the exam.