Welcome to the final lesson of our first module, "The Building Blocks of English." In the last lesson, you learned how to use adjectives and adverbs to make your sentences more detailed and descriptive. We've now covered nouns, pronouns, articles, adjectives, and adverbs. Today, we'll add the final piece of this foundational module: prepositions.
This lesson focuses on some of the most common words in English: prepositions of time and place. Your goal is to learn how to identify and correctly use prepositions like in, on, at, for, and since. Mastering these small but powerful words will help you clearly explain when and where events happen, making your English much more precise.
1. The Core Trio: In, On, At
The most common prepositions of time and place are in, on, and at. The best way to understand how to use them is to think of an inverted pyramid, moving from the most general to the most specific.
- IN is used for the most general or largest periods of time and places.
- ON is used for more specific times and places.
- AT is used for the most specific or smallest points in time and locations.
This infographic provides a fantastic visual summary of this rule.
Let's explore this rule in detail with a video. The presenter, Lucy, does an excellent job of explaining this "general to specific" concept.
IN / ON / AT - Prepositions of PLACE AND TIME | English Grammar Lesson (+ Free PDF & Quiz)
This video, "IN / ON / AT - Prepositions of PLACE AND TIME" from the English with Lucy channel, breaks down the rules for these three prepositions in a very clear and memorable way.
First, we will focus on prepositions of time. Please watch the first part of the video from the beginning until 07:15. Pay attention to how the examples move from general to specific. Introduction General to specific rule: Understand the main idea behind the pyramid. Using 'in' for periods of time: Notice how 'in' is used for large, non-specific time frames like years, months, and seasons. Using 'on' for more specific times: See how 'on' narrows it down to specific days and dates. Using 'at' for very specific times: Observe that 'at' is used for exact clock times and specific moments.
As the video explained, the same "general to specific" rule applies to prepositions of place.
- IN is for large, enclosed spaces (e.g., in a country, in a city, in a car).
- ON is for surfaces and lines (e.g., on the floor, on a street, on a bus).
- AT is for specific points or locations (e.g., at the bus stop, at an address).
Now, let's continue with the same video to see how this works for places.
IN / ON / AT - Prepositions of PLACE AND TIME | English Grammar Lesson (+ Free PDF & Quiz)
We will now watch the second half of the "IN / ON / AT" video, focusing on prepositions of place.
Please watch from 07:21 to the end. Again, focus on how the examples follow the general-to-specific pattern. Using 'in' for places: Notice the use for countries, cities, and enclosed spaces. Using 'on' for more specific places: Pay attention to the examples for streets, surfaces, and public transport. Using 'at' for very specific places: See how 'at' is used for exact addresses and specific points.
2. Duration vs. Starting Point: For vs. Since
Two other very important prepositions of time are for and since. Learners often confuse them, but the difference is quite simple.
- Use FOR to talk about a duration or a period of time (how long something lasts).
- I have lived here for two years.
- She will be in the office for three hours.
- Use SINCE to talk about a specific starting point in the past.
- I have been studying since 9 am.
- He has lived in London since 2015.
This image clearly illustrates the difference.
Let's watch a short video that reinforces this rule with a few more examples.
GRAMMAR CHALLENGE: PREPOSITIONS – at, on, in, since, for, during, while
This video, "GRAMMAR CHALLENGE" from the Learn English with Rebecca · engVid channel, includes a clear and concise explanation of 'since' versus 'for'.
Please watch the segment from "since" and "for". Focus on how 'since' is always followed by a point in time, and 'for' is followed by a period of time.
3. Practice and Consolidation
Now it's time to check your understanding. The following resource provides some excellent practice exercises.
Prepositions of time in English: 'In', 'on', 'at', 'for', 'since' and more
This article from Lingoda offers clear explanations and short quizzes to test your knowledge. We will use two of its quizzes.
First, scroll down to the section titled "Quiz" under the "Quick reference table – In / on / at". Try to complete the five sentences with in, on, or at. Check your answers below the quiz. Next, scroll further to the section on ‘For’ vs. ‘since’. Complete the three practice sentences with for or since, and check your answers.
Conclusion
In this lesson, you've learned to use some of the most essential prepositions in English to describe time and place. By understanding these rules, you can communicate with much greater accuracy.
Here are the key takeaways:
- The prepositions in, on, and at follow a "general to specific" rule for both time and place.
- In: Used for large periods (months, years) and large areas (countries, cities).
- On: Used for more specific times (days, dates) and surfaces or lines (streets, floors).
- At: Used for very specific times (clock times) and specific points (addresses, bus stops).
- For is used to express a duration of time (e.g., for three weeks).
- Since is used to mark a starting point in time (e.g., since Monday).
This lesson completes our first module, "The Building Blocks of English." You now have a solid foundation in the basic parts of speech. In our next module, "Navigating Time: Present and Past Tenses," we will begin to explore verbs in more detail, learning how to change them to talk about different times.