Prepositions of Place (AT / IN / ON) – English Grammar Exercises for A1
Your boss or teacher calls/texts to check if you have arrived. You are confirming that you are present at your workplace or school.
Choose the best option (A, B, or C) to complete each text message or spoken reply.
1 Yes, boss. I am ______ work right now.
(A) in
(B) on
(C) at
2 Hello, teacher. I am already ______ school.
(A) at
(B) in
(C) on
3 I am not late today. I am ______ the office.
(A) in
(B) at
(C) on
4 I have a lot of classes, so I am ______ university today.
(A) on
(B) in
(C) at
5 I just arrived. I am ______ my desk, ready to start.
(A) at
(B) on
(C) in
6 I am ______ college right now, waiting for the lecture to begin.
(A) in
(B) at
(C) on
7 Good morning, sir. I am physically ______ the workplace.
(A) at
(B) in
(C) on
8 Don’t worry, I am ______ the company headquarters.
(A) on
(B) at
(C) in
9 I am ready to start my shift. I am ______ the clinic.
(A) in
(B) on
(C) at
10 I am ______ the agency, just drinking my morning coffee before we open.
(A) at
(B) in
(C) on
11 I am present today. I am ______ the academy.
(A) in
(B) on
(C) at
12 I didn’t stay home. I am ______ the factory.
(A) on
(B) at
(C) in
13 Good morning, doctor. I am ______ the hospital for my nursing shift.
(A) at
(B) in
(C) on
14 I am ______ the institute, ready for our team meeting.
(A) in
(B) at
(C) on
15 I am officially ______ work, but I am still parking my car outside.
(A) on
(B) in
(C) at
16 I am ______ school, but I am not inside the classroom yet.
(A) at
(B) in
(C) on
17 I am ______ the office, but I stepped outside the building for a quick phone call.
(A) in
(B) at
(C) on
18 I am ______ university today, even though I am just sitting in the garden.
(A) on
(B) in
(C) at
19 I am ______ work right now, doing my tasks from the company cafeteria.
(A) at
(B) on
(C) in
20 I am ______ the training center, but the main doors are not open yet.
(A) in
(B) at
(C) on
ANSWER KEY & EXPLANATIONS
1 (C)
Explanation: (C) at.
Why it’s correct: “Work” is considered a general location or a point in your daily schedule, not a physical box. We always say “at work”.
Mistake Analysis: (A) “in” is a common mistake because learners think about being inside a building. (B) “on” is for surfaces, which is incorrect here.
2 (A)
Explanation: (A) at.
Why it’s correct: “School” refers to the institution or the activity of studying. We use “at school” to confirm our attendance.
Mistake Analysis: (B) “in” implies being inside the physical structure of the building, which is not the main focus of the message. (C) “on” is grammatically incorrect.
3 (B)
Explanation: (B) at.
Why it’s correct: “The office” acts as a daily destination or point on your schedule.
Mistake Analysis: (A) “in” is heavily used by learners, but “at the office” is the most natural way to confirm you have arrived at your place of work. (C) “on” is a structural error.
4 (C)
Explanation: (C) at.
Why it’s correct: Like school, “university” is an educational institution. We use “at university” to confirm presence.
Mistake Analysis: (A) “on” is wrong. (B) “in” is a common mistake.
5 (A)
Explanation: (A) at.
Why it’s correct: “My desk” is a specific point or workstation where you perform your job. You sit “at” your desk.
Mistake Analysis: (B) “on” would mean you are physically sitting on top of the desk surface. (C) “in” means inside the desk drawers.
6 (B)
Explanation: (B) at.
Why it’s correct: “College” is an institution, so it takes the preposition “at”.
Mistake Analysis: (A) “in” is a common error. (C) “on” is incorrect.
7 (A)
Explanation: (A) at.
Why it’s correct: “The workplace” is a general location point.
Mistake Analysis: (B) “in” focuses too much on the interior of the building rather than the status of being present for duty. (C) “on” is incorrect.
8 (B)
Explanation: (B) at.
Why it’s correct: “The company headquarters” is a specific destination on your map.
Mistake Analysis: (A) “on” is a structural error. (C) “in” is a distractor.
9 (C)
Explanation: (C) at.
Why it’s correct: You are confirming your presence for your shift, treating “the clinic” as a workplace/point of activity.
Mistake Analysis: (A) “in” is a common mistake. (B) “on” is incorrect.
10 (A)
Explanation: (A) at.
Why it’s correct: “The agency” is your place of business (a location point).
Mistake Analysis: (B) “in” and (C) “on” do not correctly express the concept of being present at an institution.
11 (C)
Explanation: (C) at.
Why it’s correct: “The academy” is an educational institution.
Mistake Analysis: (A) “in” and (B) “on” are incorrect prepositions for this context.
12 (B)
Explanation: (B) at.
Why it’s correct: “The factory” is where you work, acting as a point on your daily routine.
Mistake Analysis: (A) “on” is a grammar error. (C) “in” is a distractor; while you can work “in a factory”, saying you are “at the factory” is the standard way to confirm arrival to a boss.
13 (A)
Explanation: (A) at.
Why it’s correct: “The hospital” is a workplace. Using “at” confirms you have arrived for your duty.
Mistake Analysis: (B) “in” is a major meaning trap. If you say “I am in the hospital,” it usually means you are a patient receiving treatment, not an employee working there! (C) “on” is incorrect.
14 (B)
Explanation: (B) at.
Why it’s correct: “The institute” is a workplace/educational center.
Mistake Analysis: (A) “in” and (C) “on” are structural errors here.
15 (C)
Explanation: (C) at.
Why it’s correct: This question proves why “at” is used. You can be “at work” (present for duty at the location) even if you are not physically “in” the building yet.
Mistake Analysis: (A) “on” is wrong. (B) “in” is logically impossible because the second half of the sentence says you are still outside in the parking lot.
16 (A)
Explanation: (A) at.
Why it’s correct: You are confirming your attendance (“at school”), but clarifying your exact physical position.
Mistake Analysis: (B) “in” contradicts the second clause (“not inside the classroom yet”). (C) “on” is a structural error.
17 (B)
Explanation: (B) at.
Why it’s correct: You are still “at the office” (present for your work day) even if you step outside the physical doors.
Mistake Analysis: (A) “in” is incorrect because you just said you stepped outside the building. (C) “on” is incorrect.
18 (C)
Explanation: (C) at.
Why it’s correct: You are attending the institution (“at university”) regardless of whether you are in a classroom or the garden.
Mistake Analysis: (A) “on” is wrong. (B) “in” is a common mistake.
19 (A)
Explanation: (A) at.
Why it’s correct: “At work” signifies your status of being present and on duty.
Mistake Analysis: (B) “on” is a grammar error. (C) “in” cannot be used with the noun “work” in this context.
20 (B)
Explanation: (B) at.
Why it’s correct: You have arrived at the destination (“at the training center”).
Mistake Analysis: (A) “in” is logically incorrect because the doors are closed, meaning you cannot physically be inside yet. (C) “on” is incorrect.
GRAMMAR POINTS TO REMEMBER
- Institutions and Workplaces take ‘AT’:
When your boss or teacher asks where you are, you are confirming your attendance at an institution or an activity, not just your physical presence inside a 3D box. Therefore, we use “AT”.
Examples: at work, at school, at university, at college, at the office. - The “AT” vs. “IN” Logic:
- IN strictly means being enclosed inside the walls of a physical building.
- AT means you are present at the location or institution for its intended purpose. You can be “at school” or “at work” even if you are standing in the parking lot or the garden outside the building.
- Careful with meaning traps:
Be very careful with specific locations like a hospital. - I am at the hospital = I am here to work, visit someone, or attend an appointment.
- I am in the hospital = I am sick/injured and currently a patient in a hospital bed.