Preposition stranding happens when a preposition is separated from its object and left at the end of a clause, rather than placed directly before the noun or pronoun it relates to.
- Who did you go with? (preposition "with" is stranded at the end)
- With whom did you go? (preposition "with" is fronted, placed before "whom")
Both sentences are grammatically correct and mean exactly the same thing. The difference is one of style and formality, not correctness.
Where Preposition Stranding Happens
Preposition stranding is common in three main structures: wh-questions, relative clauses, and the passive voice.
1. Wh-Questions
- What are you looking for? (stranded) vs For what are you looking? (fronted, very formal/unnatural)
- Who did she talk to? (stranded) vs To whom did she talk? (fronted, formal)
2. Relative Clauses
- This is the book I was telling you about. (stranded, with "that/which" omitted)
- This is the book about which I was telling you. (fronted, more formal)
- The person I spoke to was very helpful. (stranded)
- The person to whom I spoke was very helpful. (fronted)
3. Passive Voice
- The bed hasn't been slept in. (stranded preposition in the passive)
- She was well taken care of. (stranded preposition after a phrasal verb in the passive)
When Stranding Is Preferred
In modern spoken and everyday written English, stranding a preposition is the natural, unmarked choice. Fronting the preposition, especially with "whom", often sounds stiff, old-fashioned, or overly formal in ordinary conversation.
- Natural: Who did you speak to?
- Overly formal for casual speech: To whom did you speak?
When Fronting Is Preferred
Fronting the preposition (placing it before "whom" or "which") is common in formal writing, academic prose, and legal or official documents, where a more traditional, careful register is expected.
- The committee to which the proposal was submitted will respond shortly.
- These are the values for which our organisation stands.
Note that fronting is only possible with whom and which, never with who or that — you cannot say "to who" or "about that" with a fronted structure.
Summary Table
| Style | Example | Typical context |
|---|---|---|
| Stranded | Who did you talk to? | Everyday speech and writing |
| Fronted | To whom did you talk? | Formal, academic, or legal writing |
Remember: The old rule that you should "never end a sentence with a preposition" is a myth with no real grammatical basis in English — stranding is natural, correct, and often the more idiomatic choice, especially in speech.
Common Mistakes
-
Fronting a preposition before "who" instead of "whom":
Incorrect: To who did you speak?
Correct fronted form: To whom did you speak? (or, more naturally, Who did you speak to?) -
Avoiding all stranded prepositions in casual writing, making it sound unnatural: Excessive fronting in an informal email or conversation can sound overly stiff.
Unnaturally formal for a casual message: This is the article about which I was telling you.
More natural: This is the article I was telling you about. -
Dropping the preposition entirely: Stranding means the preposition moves to the end — it should not simply disappear.
Wrong: Who did you go?
Correct: Who did you go with?
Practice Exercises
Grammar Quiz
Test your understanding with targeted questions.
Complete the Sentence
Fill in the gaps to practise the structure.
True or False
Decide whether each example sentence is correct.
Flash Cards
Drill the key rules and example sentences.
Matching Pairs
Match examples to the correct rule or category.
Unjumble
Reorder scrambled words into a correct sentence.
Practise Preposition Stranding
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Frequently Asked Questions
What is preposition stranding?
Preposition stranding is when a preposition is separated from its object and placed at the end of a clause instead of directly before the noun or pronoun, as in "Who did you go with?" instead of "With whom did you go?"
Is it grammatically wrong to end a sentence with a preposition?
No, this is a common myth with no real grammatical basis in modern English. Stranding a preposition at the end of a clause is completely grammatical and is often the more natural, idiomatic choice, especially in speech.
When should I use a stranded preposition versus a fronted one?
Use a stranded preposition ("Who did you talk to?") in everyday speech and most writing, since it sounds natural. Use a fronted preposition ("To whom did you talk?") in formal, academic, or legal writing, where a more traditional register is expected.
Can you front a preposition before 'who'?
No. Fronting a preposition is only possible before "whom" or "which", never before "who" or "that". "To who did you speak?" is incorrect; the correct fronted form is "To whom did you speak?", though the stranded form "Who did you speak to?" is far more common.
Where does preposition stranding commonly occur?
It commonly occurs in three structures: wh-questions ("What are you looking for?"), relative clauses ("This is the book I was telling you about"), and the passive voice ("The bed hasn't been slept in").
Does preposition stranding happen in the passive voice?
Yes. In sentences like "She was well taken care of" or "The bed hasn't been slept in", the preposition from a phrasal or prepositional verb is stranded at the end of the passive clause, since there is no explicit object to place it before.
Is fronting a preposition always more correct than stranding?
No, correctness is not the issue — both are grammatically correct. Fronting simply signals a higher level of formality and is more common in careful written English, while stranding is the natural default in speech and most everyday writing.
Is preposition stranding vocabulary useful for English learners?
Yes, especially for learners aiming for natural-sounding spoken English, since overusing fronted prepositions with "whom" can sound stiff or unnatural in casual conversation. Recognising both structures also helps with reading more formal or older English texts.
Can you strand a preposition in a relative clause even if 'that' or 'which' is omitted?
Yes, this is extremely common: "This is the book I was telling you about" strands the preposition "about" at the end, with the relative pronoun completely omitted. This is one of the most natural, frequent patterns in everyday spoken and written English.
Which form should I practise first: stranding or fronting?
Start with stranded prepositions, since they are the more common, natural pattern in everyday English, especially in questions like "Who is this for?" and "What are you thinking about?" Once comfortable, practise the more formal fronted pattern with "whom" and "which" for academic or professional writing.