Prepositions in relative clauses (BBC World Service)

Position of prepositions  Roger Woodham 

Note that in questions the preposition is more frequently placed at the end of the clause. It can also be placed before the  pronoun where it sounds more formal.

In which street does he live?
Which street does he live in?

For which organisation does he work? 
Which organisation does he work for?

Putting the preposition at the end of the clause is usually also possible in statements, in relative clauses

He works for a spy network, about which I know nothing. (formal)
He works for a spy network (which/ that) I know nothing about.(informal)

In formal English prepositions can come before the relative pronoun. However, it  is much more common to place prepositions at the end of the relative clause, especially in informal spoken English.


The people with whom he worked have all been arrested. (Formal) 
The people (who) he worked with have all been arrested. (Informal)

This is the bedroom in which he was murdered. (Formal) 
This is the bedroom (which/ that) he was murdered in. (Informal) 

Note from these examples, that in statements when the preposition is placed at the end of the clause, we can use that instead of who or which or we can omit the relative pronoun completely!  
Note that when the relative pronoun is placed immediately after the preposition we can't use who instead of whom, and we can't use that or zero pronoun either (whom  for people and which for things are the only options). 

 Whom is formal and most often used when writing. 

Examples: The banker to whom I gave my check was quite friendly. -( formal)
The banker whom/ who I gave my check to was quite friendly
The banker I gave my check to was quite friendly.(informal)

The woman I talked to was very pleasant indeed. - (informal)
Examples: The bank manager, to whom he addressed his complaints, was very unhelpful. -( forma)l.
The local branch manager, who I talked to about my problems, was very helpful. - (informal)

 
Preposition + relative pronoun 

A wide range of prepositions are often used in prepositional structures with relative pronouns who and which to introduce relative clauses. In most cases, the prepositions retain their original meaning. Compare the following:

That post marks the beginning of the mined area, beyond which it is inadvisable to go.

In the clearing lay the badly injured soldier, above whom birds of prey were circling.

We passed a giant toadstool in the forest,under which fairies were sitting.

They had collected the sap from the sugar maple trees, from which maple syrup is manufactured.

Before us we could see a forest orchid of which there are many varieties.

An Austrian naturalist, with whom I worked closely in the Eighties, discovered this particular orchid. 


 Where / in which / at which

In which and at which are sometimes used as more precise sounding alternatives to where to introduce relative clauses after nouns referring to place:

Near where I live there's a wood where you can find woodpeckers.
Near where I live there's a wood in which you can find woodpeckers. 
The fancy-dress party, where the men all turned up as gangsters, was held in Manhatten. 
The fancy-dress party, at which the men all turned up as gangsters, was held in Manhatten.

when / on which

On which is sometimes used as a more precise sounding alternative to when to introduce relative clauses after nouns referring to time:

The day when I'm forced to give up riding will be a sad day for me.
The day on which I'm forced to give up riding will be a sad day for me.   

   

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