Definition / Explanation
Relative clauses often include prepositions, and English offers two main patterns. In everyday speech, the preposition usually stays at the end: the person I spoke to. In more formal English, the preposition can move before the relative pronoun: the person to whom I spoke. Both patterns are grammatically correct, but they belong to different registers. Learners need to understand both so they can read formal texts and also sound natural in conversation. The main choice is usually about style, not meaning.
Key Rules
- Everyday pattern: the person I spoke to, the company she works for.
- Formal pattern: the person to whom I spoke, the company for which she works.
- Use whom mainly in formal written English after a preposition.
- Do not front the preposition before that or zero relative pronouns.
- Choose the structure based on register and naturalness.
Examples
- The colleague I spoke to agreed.
- The colleague to whom I spoke agreed.
- This is the room we met in.
- This is the room in which we met.
- The topic she is interested in is complex.
Common Mistakes
- ❌ The colleague to that I spoke agreed. -> ✅ The colleague to whom I spoke agreed.
- ❌ This is the room in that we met. -> ✅ This is the room in which we met. / ✅ This is the room we met in.
- ❌ The topic in she is interested is complex. -> ✅ The topic she is interested in is complex.