question word + auxiliary + subject + main verb + prepositionThis is the normal neutral pattern: Who did you speak to? What are they talking about?
Preposition Stranding vs Fronting
B2English can leave a preposition at the end or move it before whom/which. End position is neutral; fronting sounds formal.
What you'll learn
- Ask neutral questions with the preposition at the end.
- Form formal questions with preposition + whom.
- Choose the pattern that fits the context and level of formality.
- Use that or no relative word when the preposition stays later.
- Use which or whom after a fronted preposition.
Structure
preposition + whom + auxiliary + subject + main verbUse this in formal style. After a fronted preposition in questions about people, choose whom.
noun + (that / zero) + subject + main verb + prepositionWith stranding in relative clauses, that or no relative word is possible: the person I spoke to.
noun + preposition + which/whom + subject + main verbIf the preposition comes first, use whom for people and which for things. Do not use that here.
Build a sentence
Target
Structure
Whodidyouspeakto
Who did you speak to?
Neutral English normally leaves the preposition at the end.
When to use
Everyday questions
In conversation, interviews, and neutral emails, speakers normally strand the preposition: Who did you speak to?
Formal writing
In formal letters, reports, and careful academic prose, fronting is possible: To whom did you speak?
Relative clauses
Both patterns appear in relative clauses: the person I spoke to / the person to whom I spoke. Fronting sounds more formal.
Markers
Who did you speak to?To whom did you speak?the person I spoke tothe person to whom I spokeformal reportcasual message
Common mistakes
Wrong
To who did Anna speak after the meeting?
Correct
To whom did Anna speak after the meeting?
After a fronted preposition in formal style, use whom for people.
Wrong
The chair on that Maria sat was broken.
Correct
The chair that Maria sat on was broken.
If you use that, keep the preposition later in the clause. Do not put a fronted preposition before that.
Wrong
The colleague to who I wrote replied today.
Correct
The colleague to whom I wrote replied today.
After a fronted preposition for a person, use whom, not who.
Wrong
Casual text: To whom are you talking right now?
Correct
Casual text: Who are you talking to right now?
Fronting is grammatical, but it sounds too formal for a casual message.
Common misconceptions
❝ Putting the preposition first is always better English. ❞
Both patterns are correct. Fronting is more formal; stranding is the normal neutral choice in modern English.
❝ If a clause has a preposition, I must use which or whom. ❞
Not when the preposition stays later in the clause. Then that or no relative word is often possible: the person I spoke to.
Skills in this rule (5)
LEAVE_PREPOSITION_AT_END_IN_NEUTRAL_QUESTIONSw5Leave the preposition at the end in neutral questions
In everyday questions, the preposition often stays after the verb or at the end. This is the normal choice in spoken and neutral written English.
MOVE_PREPOSITION_BEFORE_WHOM_IN_FORMAL_STYLEw4Move the preposition before whom in formal style
In formal questions and relative clauses, place the preposition before whom. Use this pattern in formal writing and careful style.
MATCH_STYLE_TO_CONTEXTw4Match neutral or formal style to the context
Choose stranding for everyday speech and neutral writing. Choose fronting with whom for formal letters, reports, and careful academic style.
USE_THAT_OR_ZERO_WITH_STRANDED_PREPOSITIONSw4Use that or no relative word when the preposition stays at the end
When the preposition stays later in the clause, you can often use that or no relative word. This pattern is common in neutral style.
USE_WHICH_OR_WHOM_AFTER_FRONTED_PREPOSITIONSw5Use which or whom after a fronted preposition
If the preposition comes before the relative word, use which for things and whom for people. Do not use that after a fronted preposition.