“In Which”, “Of Which”, “At Which”, “To Which” – Usage Guide

Marcus Froland

Do you ever find yourself stumped by the words “in which”, “of which”, “at which”, and “to which”? If so, don’t worry – you’re not alone! This article will provide detailed explanation for each of these words so that you can use them confidently in conversation.

We’ll go over the different grammatical functions of each word and how to properly incorporate them into sentences. With a bit of practice and guidance from this article, you’ll soon master the usage guide for “in which”, “of which”, “at which” and “to which’.

Key Takeaways

  • ‘In which’ is used to provide more information about a noun or pronoun in a specific context or place.
  • ‘Of which’ indicates possession or ownership and provides further information and context.
  • ‘At which’ refers to a particular moment or occasion, describing an instance or action.
  • ‘To which’ is used to provide additional information or clarification, linking clauses and avoiding repetition in writing.

Grammatical Overview of ‘In Which’, ‘Of Which’, ‘At Which’, and ‘To Which’

All four phrases, ‘in which’, ‘of which’, ‘at which’, and ‘to which’, have different grammatical uses.

‘In Which’ is used to introduce a subordinate clause that modifies or provides more information about a noun or pronoun in the main clause.

‘Of Which’ is used to indicate possession or ownership and can also refer back to an already-mentioned noun.

‘At Which’ introduces subordinate clauses that are temporal, meaning they provide information about time.

Lastly, ‘To Which’ typically indicates direction towards something specific.

It’s important to understand the usage of each phrase in order to communicate effectively and accurately in English.

How to Use ‘In Which’ in a Sentence

You want to use the phrase ‘in which’ when you need to refer to a specific context or place.

For example:

  1. When referring to a particular time or location, such as “The summer in which I graduated college”

  2. To clarify an already-stated sentence, such as “She was born and raised in Paris, in which she learned French”

  3. To specify an event within a larger timeframe, like “The month in which we launched our website”

  4. To provide details about something that has been mentioned previously, for instance “The house in which I grew up”

Using ‘in which’ correctly can add clarity and precision to your writing. Being mindful of its usage will help you communicate with accuracy and detail while also conveying your points clearly and concisely to your readers.

How to Use ‘Of Which’ in a Sentence

Most sentences with ‘of which’ refer to a previously mentioned noun or group of words. They provide further information about them, giving context and details to clarify something. For example, you might say, ‘The city has many landmarks. Of which, the most famous is the Eiffel Tower.’ Here, ‘of which’ refers back to landmarks and provides extra information about the Eiffel Tower. This phrase can also be used when talking about groups of people. For instance, ‘Our team consists of five members. Of which, two are new recruits.’ In this case, it refers back to the five members and specifies two out of the five who are new recruits. Using ‘of which’ correctly in a sentence helps make your writing clearer and more precise.

How to Use ‘At Which’ in a Sentence

At some points, ‘at which’ can be used to refer to a particular moment or occasion. For example, you might say, ‘He arrived at the party, at which point the music began.’ In this sentence, ‘at which’ is referring to the moment when he arrived and the music was played.

Additionally, it can also be used to describe an instance in which something happens; for instance, ‘The food was served at 8 p.m., at which time everyone started eating.’ Here, ‘at which’ is describing the event of 8 p.m., when everyone began eating the food.

Knowing how to use ‘at which’ correctly in a sentence can help make your writing more precise:

  • It identifies a specific event or moment in time
  • It emphasizes an action that takes place within that timeframe
  • It adds clarity by providing clear context for a given situation
  • It prevents confusion by specifying what action took place when

How to Use ‘To Which’ in a Sentence

You’ll often find ‘to which’ used to provide additional information or clarification on a particular topic. Contractions like ‘it’s’ and ‘they’re’ can help make your writing more conversational, so don’t be afraid to use them when employing this phrase in a sentence.

To which is typically used as part of an introductory phrase that links two clauses together, making it easier for the reader to understand the context. For example, you might say something like “The decision was made based on the results of the survey, to which all members responded positively”.

This sentence indicates that all members responded positively to the survey results, which were then used as justification for the decision made. Additionally, using “to which” allows you to specify what it is that you are referring without having to repeat yourself multiple times throughout your writing.


In conclusion, it’s important to understand the proper usage of ‘in which’, ‘of which’, ‘at which’ and ‘to which’.

If you remember that ‘in which’ generally refers to a location or time, ‘of which’ is used when referring to an object in relation to another, and both ‘at which’ and ‘to which’ refer to places or directions, you’ll be able to use these terms with confidence.

Now go forth and show off your knowledge!