English Prepositions In, On, At — Rules, Examples and Common Mistakes

📌 Introduction / Introducción

One of the most confusing topics for English learners is how to use the prepositions in, on, and at. Each one has different uses depending on time, place, and context.

Uno de los temas más confusos en inglés es cómo usar las preposiciones in, on y at. Cada una se usa de forma diferente según el tiempo, el lugar o el contexto.

🔍 Quick Reference Table / Tabla de referencia rápida

Preposition	Used for	Ejemplo	Traducción
In	Months, years, periods / Inside	in 2020, in the room	en 2020, en la habitación
On	Days, dates, surfaces	on Monday, on the table	el lunes, sobre la mesa
At	Specific times, addresses, places	at 5 PM, at the door	a las 5 PM, en la puerta

📝 Examples / Ejemplos

🔹 Using In:

• I was born in 1990. (Nací en 1990.)
• She is in the kitchen. (Ella está en la cocina.)

🔹 Using On:

• The meeting is on Monday. (La reunión es el lunes.)
• The book is on the table. (El libro está sobre la mesa.)

🔹 Using At:

• Let’s meet at 6 PM. (Nos vemos a las 6 PM.)
• He is waiting at the bus stop. (Él está esperando en la parada de autobús.)

❌ Common Mistakes / Errores comunes

• ❌ I was born at 1990. → ✅ I was born in 1990.
• ❌ The meeting is in Monday. → ✅ The meeting is on Monday.
• ❌ He is waiting on the bus stop. → ✅ He is waiting at the bus stop.

🎯 Quick Test / Mini Test

Choose the correct preposition (in, on, at):

1. My birthday is ___ July.
2. She is ___ the office.
3. The movie starts ___ 8 PM.
4. The book is ___ the table.
5. I have a meeting ___ Friday.

✅ Answers / Respuestas

1. in
2. at
3. at
4. on
5. on

✍️ Bonus Practice

Write 3 sentences using in, 3 with on, and 3 with at.
Example:

• I was born in 1995.
• The keys are on the desk.
• The class starts at 9 AM.

🔗 Extra Resource

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